초록 ▼

There are disclosed solventless silicone coating compositions comprising a homogeneous mixture of (A) a liquid silicone resin reaction product prepared by hydrolyzing an equilibrated mixture of (i) a first silane and (ii) a first diorganopolysiloxane, (B) a second silane and (C) a second diorganopol

There are disclosed solventless silicone coating compositions comprising a homogeneous mixture of (A) a liquid silicone resin reaction product prepared by hydrolyzing an equilibrated mixture of (i) a first silane and (ii) a first diorganopolysiloxane, (B) a second silane and (C) a second diorganopolysiloxane. The compositions find utility as protective coatings, particularly in corrosion resistant high temperature paint applications. Coatings having excellent humidity resistance are formed when the compositions of the present invention are further modified with a minor portion of an amine-functional polydimethylsiloxane.

대표청구항 ▼

A composition comprising: (A) 100 parts by weight of a liquid silicone resin prepared by a process comprising (I) reacting a mixture consisting essentially of (i) a first silane having the average general formula R1aSi(OR)4-a wherein R is selected from the group consisting of methyl, ethyl, propyl a

A composition comprising: (A) 100 parts by weight of a liquid silicone resin prepared by a process comprising (I) reacting a mixture consisting essentially of (i) a first silane having the average general formula R1aSi(OR)4-a wherein R is selected from the group consisting of methyl, ethyl, propyl and acetyl radicals, R1 is a monovalent hydrocarbyl group selected from the group consisting of phenyl and alkyl radicals having 1 to 3 carbon atoms and a is 1 to 2, (ii) a first diorganopolysiloxane, having organic groups independently selected from the group consisting of phenyl, vinyl, alkyl radicals having 1 to 4 carbon atoms and halogenated alkyl radicals having 1 to 4 carbon atoms and (iii) an equilibrating amount of an acid catalyst having the formula ZSO3H wherein Z is a perfluoroalkyl group having 1 to about 10 carbon atoms, the molar ratio of said silane (i) to said diorganopolysiloxane (ii) being between about 1:1 and about 10:1, (II) hydrolyzing the reaction product formed in step (I) with sufficient water to provide from about 0.5 to about 1 mole of residual －OR functionality per 100 parts by weight of said liquid silicone resin and (III) neutralizing said acid catalyst (iii); (B) from about 1 to 100 parts by weight of a second silane having the general formula R3Si(OR)3 wherein R3 is selected from the group consisting of phenyl vinyl, alkyl radicals having 1 to 4 carbon atoms and halogenated alkyl radicals having 1 to 4 carbon atoms and R has the definition set forth in (A)(I)(i) above; and (C) from about 1 to 200 parts by weight of a second diorganopolysiloxane having the average formula R4O(R5R6SiO)yR4 wherein y is about 3 to 10, R4 is selected from the group consisting of hydrogen and the above defined R groups and R5 and R6 are selected from the group consisting of phenyl, vinyl, alkyl radicals having 1 to 4 carbon atoms and halogenated alkyl radicals having 1 to 4 carbon atoms.