Flame retardant and auto-catalytic polyesters for polyurethanes
AssigneeCOIM ASIA PACIFIC Pte. LTD.
InventorWally Liyuan Chang
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Abstract
Flame retardant polyesters obtainable by reacting an aromatic or aliphatic dicarboxylic acid and/or ester of anhydride thereof, with an aliphatic polyol or mixtures thereof and with melamine, are provided. Methods of making said polyesters are also provided.
Claims16
A flame-retardant polyester polyol obtained by reacting an aromatic or aliphatic dicarboxylic acid and/or ester or anhydride thereof, with an aliphatic polyol or mixtures thereof and with melamine, wherein said aliphatic polyol comprises at least a glycol and optionally an aliphatic polyol having more than two OH groups selected from the group consisting of glycerin, trimethylolpropane, pentaerythritol, dipentaerythritol, tripentaerythritol, sorbitol, glucose, sucrose, polyglycerol and mixtures thereof, said polyester polyol comprising compounds of the formula:
- wherein
- R1 is an alkylene group —(CH2)n— wherein n is an integer from 1 to 20 or an oxyalkylene group —[(CH2)m—O]p—(CH2)r, wherein m is an integer from 1 to 10, p is an integer from 1 to 10 and r is an integer from 1 to 10,
- R2 is an aromatic or aliphatic group, and
- x, y and z, independently one from the other are integers from 1 to 20.
A method for producing polyurethanes or polyisocyanurates having flame-retardant properties by reacting a di- or polyisocyanate with a polyester polyol obtained by reacting an aromatic or aliphatic dicarboxylic acid and/or ester or anhydride thereof, with an aliphatic polyol or mixtures thereof and with melamine, wherein said aliphatic polyol comprises at least a glycol and optionally an aliphatic polyol having more than two OH groups selected from the group consisting of glycerin, trimethylolpropane, pentaerythritol, dipentaerythritol, tripentaerythritol, sorbitol, glucose, sucrose, polyglycerol and mixtures thereof, comprising:
- a) dicarboxylic acid, ester thereof or anhydride thereof derived moieties,
- b) polyol derived moieties and
- c) melamine derived moieties, wherein the melamine derived moieties are present in the polyester backbone in a molar amount of from 5 to 40% by moles, referred to the sum of a), b) and c) moles, said polyester polyol having melamine in the polyester backbone and having a number average molecular weight from 200 to 6000 Dalton.
Dependencies are inferred from the claim text.