초록 ▼

An aqueous dispersion coating for rubber and polymer substrates comprises a blend of a polysiloxane and a curable polyurethane and various additives such as a urethane crosslinking agent, a heat resistant filler, and the like. The aqueous dispersion coating reduces the noise upon contact or movement

An aqueous dispersion coating for rubber and polymer substrates comprises a blend of a polysiloxane and a curable polyurethane and various additives such as a urethane crosslinking agent, a heat resistant filler, and the like. The aqueous dispersion coating reduces the noise upon contact or movement of the coated substrate with an article and maintains the initial static coefficient of friction therewith over a period of time. A desired end use is as a coating on vehicle weatherstrips such as for doors, trunks, and other enclosing articles.

대표청구항 ▼

What is claimed is: 1. An aqueous dispersion composition, comprising: a polymer blend comprising a) an aqueous dispersion of at least one polysiloxane and b) an aqueous dispersion of at least one polyurethane, wherein the amount of said at least one polysiloxane polymer ranges from about 50% to abo

What is claimed is: 1. An aqueous dispersion composition, comprising: a polymer blend comprising a) an aqueous dispersion of at least one polysiloxane and b) an aqueous dispersion of at least one polyurethane, wherein the amount of said at least one polysiloxane polymer ranges from about 50% to about 85% by weight and the amount of said at least one polyurethane ranges from about 15% to about 50% by weight based upon the total solids weight of said at least one polysiloxane polymer and said at least one polyurethane polymer, said polyurethane derived from at least one aliphatic or cycloaliphatic diisocyanate; said polyurethane being heat curable; and c) a polyolefin in an amount of from about 5 parts by weight to about 35 parts by weight per 100 total parts by weight of said one or more polysiloxanes and said one or more polyurethanes; said aqueous dispersion containing about 7% by weight or less of an organic solvent based upon the total weight of said dispersion composition; said polymer blend containing less than about 10 parts by weight of a tackifier based upon 100 total parts by weight of said at least one polyurethane and said at least one polysiloxane; and said polymer blend containing less than about 10 parts by weight of a halogen containing polymer based upon 100 total parts by weight of said at least one polyurethane and said at least one polysiloxane. 2. An aqueous dispersion composition according to claim 1, wherein the amount of said polysiloxane from about 55% to about 80% by weight and wherein the amount of said polyurethane is from about 20% to about 45% by weight based upon the total weight of said at least one polysiloxane polymer and at least one polyurethane polymer. 3. An aqueous dispersion composition according to claim 2, wherein said polyolefin comprises a polyethylene in an amount of from about 10 parts by weight to about 30 parts by weight, and wherein said polyurethane is derived from a polyether intermediate. 4. An aqueous dispersion composition according to claim 3, wherein the weight average molecular weight of said polyethylene is from about 2 million to about 5 million; wherein the amount of said tackifier is less than about 5 parts by weight; and wherein the amount of said halogen containing polymer is less than about 5 parts by weight. 5. An aqueous dispersion composition according to claim 4, wherein said polysiloxane comprises poly(dimethylsiloxane), wherein the amount of any polysiloxane having an amine end group is about 10% by weight or less based upon the total weight of all polysiloxanes, wherein the amount of said polyethylene is from about 15 to about 25 parts by weight, wherein the amount of any organic solvent is about 5% by weight or less; wherein the amount of said tackifier is less than 1 part by weight; and wherein the amount of said halogenated polymer is less than 1 part by weight. 6. An aqueous dispersion composition according to claim 5, wherein the amount of said polysiloxane ranges from about 60% to about 75% by weight and wherein the amount of said polyurethane ranges from about 25% to about 40% by weight based upon the total weight of said at least one polysiloxane and said at least one polyurethane; and wherein said polyethylene has a weight average molecular weight of from about 3 million to about 4 million. 7. A polymer or rubber substrate at least partially coated with the dried aqueous composition of claim 1, and wherein the wet random noise level of said substrate according to GM test method GM9842P, Rev. A is about 42 dBA or less. 8. A polymer or rubber substrate at least partially coated with the dried aqueous composition of claim 3, and wherein said substrate is a rubber, an acrylate, a vinyl or vinylidene polymer, a polyamide, a polyester, a polyurethane, a polyolefin, a thermoplastic olefin, or a thermoplastic vulcanizate, or combinations thereof; and wherein the wet random noise level of said substrate according to GM test method GM9842P, Rev. A is about 40 dBA or less. 9. A polymer or rubber substrate at least partially coated with the dried aqueous composition of claim 5, and wherein said substrate is a rubber, an acrylic, a vinyl or vinylidene polymer, a polyamide, a polyester, a polyurethane, a polyolefin, a thermoplastic olefin, or a thermoplastic vulcanizate, or combinations thereof and wherein the wet random noise level of said substrate according to GM test method GM9842P, Rev. A is about 38 dBA or less, and wherein said substrate according to ASTM D1894-95 has an initial static coefficient of friction value of about 0.40 or less. 10. A polymer or rubber substrate at least partially coated with the dried aqueous composition of claim 6, and wherein said substrate is an ethylene-propylene-diene rubber, a thermoplastic elastomer, or thermoplastic olefin, or combinations thereof and wherein said wet random noise level of said substrate according to GM test method GM9842P, Rev. A is about 36 dBA or less, and wherein said substrate according to ASTM D1894-95 has an initial static coefficient of friction value of about 0.32 or less. 11. A weatherstrip for a vehicle, said weatherstrip being at least partially coated with the dried, aqueous composition of claim 1, and wherein the wet random noise level of said substrate according to GM test method GM9842P, Rev. A is about 42 dBA or less. 12. A weatherstrip for a vehicle, said weatherstrip being at least partially coated with the dried, aqueous composition of claim 3, and wherein the wet random noise level of said substrate according to GM test method GM9842P, Rev. A is about 40 dBA or less. 13. A weatherstrip for a vehicle, said weatherstrip being at least partially coated with the dried, aqueous composition of claim 5, and wherein said weather strip comprises a rubber, an acrylate, a polyamide, a urethane, or combinations thereof, and wherein the wet random noise level of said substrate according to GM test method GM9842P, Rev. A is about 38 dBA or less. 14. A weatherstrip for a vehicle, said weatherstrip being at least partially coated with the dried, aqueous composition of claim 7, and wherein said weather strip comprises a rubber, an acrylic, a polyamide, a urethane, or combinations thereof, and wherein the wet random noise level of said substrate according to GM test method GM9842P, Rev. A is about 36 dBA or less. 15. The weatherstrip of claim 11, wherein said weatherstrip according to ASTM Test D-1894-95 has an initial static coefficient of friction value of about 0.40 or less. 16. The weatherstrip of claim 12, wherein said weatherstrip according to ASTM Test D-1894-95 has an initial static coefficient of friction value of about 0.35 or less. 17. The weatherstrip of claim 14, wherein said weatherstrip according to ASTM Test D-1894-95 has an initial static coefficient of friction value of about 0.32 or less and wherein the static coefficient of friction is maintained for at least about 40 weeks. 18. A low noise vehicle weatherstrip, comprising: a weatherstrip substrate, said weatherstrip substrate having at least a surface thereof coated with a polymer composition, said polymer composition comprising from about 50% to about 85% by weight of at least one polysiloxane polymer and from about 15% to about 50% by weight of at least one polyurethane based upon the total weight of said at least one polysiloxane polymer and said at least one polyurethane polymer, said polyurethane derived from at least one aliphatic or cycloaliphatic diisocyanate, said polyurethane being cured; from about 5 to about 35 parts by weight of a polyolefin per 100 total parts by weight of said one or more polysiloxanes and said one or more polyurethanes; wherein said polymer composition contains less than about 10 parts by weight of a tackifier agent based upon 100 total parts by weight of said one or more polyurethanes and said one or more polysiloxanes; and wherein said polymer composition contains less than about 10 parts by weight of a halogen containing polymer based upon 100 total parts by weight of said one or more polyurethanes and said one or more polysiloxanes. 19. The vehicle weatherstrip of claim 18, wherein the amount of said polysiloxane is from about 55% to about 80% by weight and wherein the amount of said polyurethane is from about 20% to about 45% by weight, wherein said polyurethane is derived from a polyether intermediate; and wherein said polyolefin comprises a polyethylene in an amount of from about 10 to about 30 parts by weight per 100 total parts by weight of said one or more polysiloxanes and said one or more polyurethanes. 20. The vehicle weatherstrip of claim 19, wherein the amount of said polysiloxane is from about 60% to about 75% by weight and wherein the amount of polyurethane is from about 25% to about 40% by weight; wherein said polysiloxane comprises poly(dimethylsiloxane); wherein said polyethylene has a weight average molecular weight of from about 2 million to about 5 million; wherein the amount of said tackifier agent is 2 parts by weight or less; and wherein the amount of said halogen containing polymer is 1 part by weight or less. 21. The vehicle weatherstrip of claim 18, wherein said weatherstrip has a noise level according to GM test GM9842P, Rev. A, of about 42 dBA or less. 22. The vehicle weatherstrip of claim 19, wherein said weatherstrip has a wet random noise level according to GM test GM9842P, Rev. A, of about 40 dBA or less; and wherein said polymer substrate is an acrylate, a vinyl or vinylidene polymer, a polyamide, a polyester, a polyurethane, a polyolefin, a thermoplastic olefin, or a thermoplastic elastomer, or combinations thereof. 23. The vehicle weatherstrip of claim 20, wherein said weatherstrip has a wet random noise level according to GM test GM9842P, Rev. A, of about 36 dBA or less, and wherein said substrate comprises a rubber, a thermoplastic elastomer, an acrylic, a polyamide, a urethane, or combinations thereof. 24. The vehicle weatherstrip of claim 18, wherein said weatherstrip according to ASTM Test D-1894-95 has an initial static coefficient of friction value of about 0.40 or less. 25. The vehicle weatherstrip of claim 20, wherein said weatherstrip according to ASTM Test D-1894-95 has an initial static coefficient of friction value of about 0.35 or less. 26. The vehicle weatherstrip of claim 21, wherein said weatherstrip according to ASTM Test D-1894-95 has an initial static coefficient of friction value of about 0.35 or less. 27. The vehicle weatherstrip of claim 23, wherein said weatherstrip according to ASTM Test D-1894-95 has an initial static coefficient of friction value of about 0.32 or less and wherein the static coefficient of friction is maintained for at least about 40 weeks.