초록 ▼

A lap edge sealant composition is provided for adhering together overlapping sheets of roofing material which includes a rubbery polymer such as EPDM, a thermoplastic rubber, a tackifier, and a solvent, where the solvent is selected from aliphatic hydrocarbons, para-chlorobenzotrifluoride, or blends

A lap edge sealant composition is provided for adhering together overlapping sheets of roofing material which includes a rubbery polymer such as EPDM, a thermoplastic rubber, a tackifier, and a solvent, where the solvent is selected from aliphatic hydrocarbons, para-chlorobenzotrifluoride, or blends thereof. The lap edge sealant has a high solids content of about 65 to 90%, a volatile organic compound (VOC) content of less than about 250 g/l, and exhibits no more than about 35% shrinkage upon curing.

대표청구항 ▼

1. A lap edge sealant composition for sealing the lap joints of roofing materials comprising: an EPDM rubber; a styrene-ethylene/propylene copolymer; a tackifier; and a solvent, said composition having a volatile organic compound (VOC) content of less than about 250 g/l. 2. The lap edge seal

1. A lap edge sealant composition for sealing the lap joints of roofing materials comprising: an EPDM rubber; a styrene-ethylene/propylene copolymer; a tackifier; and a solvent, said composition having a volatile organic compound (VOC) content of less than about 250 g/l. 2. The lap edge sealant of claim 1 further including a plasticizer. 3. The lap edge sealant of claim 1 wherein said tackifier is selected from the group consisting of aliphatic hydrocarbon resins, polybutene, or combinations thereof. 4. The lap edge sealant of claim 1 wherein said solvent is selected from the group consisting of aliphatic hydrocarbons, para-chlorobenzotrifluoride, and blends thereof. 5. The lap edge sealant of claim 4 wherein said aliphatic hydrocarbons are selected from the group consisting of n-pentane, n-hexane, n-heptane, n-octane, and naphtha. 6. The lap edge sealant of claim 5 wherein said solvent comprises naphtha. 7. The lap edge sealant of claim 4 wherein said solvent comprises from about 26% by weight para-chlorobenzotrifluoride and from about 74% by weight naphtha. 8. The lap edge sealant of claim 4 wherein said solvent comprises from about 33% by weight high flash naphtha and from about 67% by weight VM&P naphtha. 9. The lap edge sealant of claim 1 further including an accelerator/cure package. 10. The lap edge sealant of claim 1 wherein said accelerator/cure package comprises a mixture of a sulfur-containing composition and zinc oxide. 11. A lap edge sealant composition comprising: an EPDM rubber; a thermoplastic elastomer; a tackifier; and a solvent comprising para-chlorobenzotrifluoride and naptha, said composition having a volatile organic compound (VOC) content of less than about 250 g/l. 12. A lap edge sealant composition comprising: an EPDM rubber; a thermoplastic elastomer; a tackifier; and a solvent comprising naptha and VM&P naptha, said composition having a volatile organic compound (VOC) content of less than about 250 g/l. 13. A lap edge sealant composition comprising: an EPDM rubber having a Mooney viscosity of from about 1 to 40; a thermoplastic elastomer; a tackifier; and a solvent, said composition having a volatile organic compound (VOC) content of less than about 250 g/l. 14. A lap edge sealant composition comprising: an EPDM rubber; a thermoplastic elastomer; a tackifier; an accelerator/cure package; and a solvent, said composition having a volatile organic compound (VOC) content of less than about 250 g/l and exhibiting no more than about 35% shrinkage upon curing.