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US 4,383,062 AGranted
Waterborne coating compositions
AssigneeGeneral Electric Company
InventorsWilliam T. Saad, Robert F. Stodgell
Life of this patent
Estimating the term…
Abstract
Waterborne silicone coating formulations are provided. The coatings utilize water based emulsions or organopolysiloxane resins where the emulsions are provided with an effective combination of cellulosic and anionic emulsifying agents. The coatings of the present invention offer durability and resistance to extreme temperatures.
Claims21
A waterborne silicone coating composition comprising:
- (a) 50 to 70 parts by weight of a silicone resin-water emulsion comprised of 100 parts by weight of (i) at least one organopolysiloxane resin composition comprising units selected from the group consisting of R.sub.3 SiO.sub.0.5, R.sub.2 SiO, R SiO.sub.1.5 and SiO.sub.2, wherein R is, independently, a substituted or unsubstituted monovalent hydrocarbon radical and said organopolysiloxane resin has an R to Si ratio of, approximately, 1.0 to 1.99 R groups for each silicon atom;
- (ii) a combination of emulsifying agents effective for dispersing said organopolysiloxane resin in a water based emulsion wherein said emulsifying agent combination is comprised of 5 to 95 percent by weight of a cellulosic emulsification agent and 5 to 95 percent by weight of an anionic emulsifying agent;
- and (iii) an amount of water effective for providing a preselected silicone resin solids content by weight of said silicone resin-water emulsion;
- (b) 25 to 50 parts by weight pigment;
- (c) 4 to 12 parts by weight coupling solvent;
- (d) 0 to 1 parts by weight neutralizing agent;
- (e) 4 to 8 parts by weight water;
- and
- (f) 0 to 0.2 parts by weight catalyst.
6 more elements
A process for providing a waterborne silicone coating composition comprising the steps of:
- I. providing a mill base comprised of, approximately, 25 to 50 parts by weight pigment, 4 to 12 parts by weight coupling solvent, 0 to 1 parts by weight neutralizing agent, 0 to 0.2 parts by weight catalyst, and 4 to 8 parts by weight water;
- II. blending said mill base with 50 to 70 parts by weight of a silicone resin-water emulsion.
Dependencies are inferred from the claim text.