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US 4,731,294 AGranted
Organopolysiloxane coating compositions having improved hardness
AssigneeRhone-Poulenc Specialites Chimiques
InventorsJean-Marie Pouchol, Louis Gros
Life of this patent
Estimating the term…
Abstract
Methylphenylsiloxane coating compositions comprising silica fillers and aluminum particulates, e.g., matte paints, are well adopted for the provision of hard nonadhesive finishes, e.g., on kitchen utensils.
Claims11
An organopolysiloxane composition of matter, comprising:
- (A) 100 parts of a methylphenylpolysiloxane resin, in organic solvent solution, which comprises recurring units of the formulae CH.sub.3 SiO.sub.1.5, (CH.sub.3).sub.2 SiO, (C.sub.6 H.sub.5)CH.sub.3 SiO, C.sub.6 H.sub.5 SiO.sub.1.5 and (C.sub.6 H.sub.5).sub.2 SiO, distributed in a C.sub.6 H.sub.5 /Si ratio of 0.3 to 0.85 and a (C.sub.6 H.sub.5 +CH.sub.3)/Si ratio of 1.1 to 1.65, and having a concentration of hydroxyl groups bonded to silicon atoms of 0.5 to 9%;
- (B) 3 to 25 parts of a finely divided silica having a BET specific surface of at least 40 m.sup.2 /g;
- and
- (C) 5 to 45 parts of aluminum powder, with the proviso that the weight ratio [(B)+(C)]/(A) ranges from 0.15 to 0.50
1 more element
Dependencies are inferred from the claim text.