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US 5,206,275 AGranted
Expandable powder coating composition
AssigneeSomar Corporation
InventorsMasao Kubo, Atumi Nakamura, Tetsuo Miyake, Katsuji Kitagawa, Katsuya Sano, Kiyoshi Kittaka, Tetsuya Sakakibara
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Abstract
An expandable, powder coating composition is disclosed which includes (a) a thermoplastic resin containing a hydroxyl group-containing polymer, (b) a cross-linking agent containing a polyisocyanate compound which is capable crosslinking the thermoplastic resin, (c) a blowing agent, and (d) a mixture of a solid plasticizer such as triphenyl phosphate and a liquid plasticizer such as dioctyl phthalate.
Claims10
An expandable, powder coating composition comprising:
- (a) a thermoplastic resin containing a hydroxyl group-containing polymer;
- (b) a cross-linking agent containing a polyisocyanate compound which is capable of reacting with the hydroxyl groups of said polymer at a temperature higher than the melting point of said thermoplastic resin to crosslink said polymer and which is solid at room temperature;
- (c) a blowing agent capable of decomposing and generating a gas when heated to a temperature higher than the melting point of said thermoplastic resin;
- and
- (d) a mixture of solid and liquid plasticizers, said solid plasticizer being selected from the group consisting of triphenyl phosphate and a first ester having the following general formula:
- ##STR8## wherein R.sup.1 and R.sup.2 represent independently from each other an alkyl group having 12 or more carbon atoms, said liquid plasticizer being selected from the group consisting of dioctyl phthalate and a second ester having the following general formula:
- ##STR9## wherein R.sup.3 and R.sup.4 represent independently from each other an alkyl group having 1-10 carbon atoms.
4 more elements
Dependencies are inferred from the claim text.