Polycarbodiimide copolymer and production method thereof
AssigneeNitto Denko Corporation
InventorsNaoki Sadayori, Yuji Hotta
Life of this patent
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Abstract
A polycarbodiimide copolymer which comprises at least one structural unit selected from rubber residues represented by the following formulae (1) and (2) in a number “m”: 1 and a structural unit represented by the following formula (3) in a number “n”: 2 and which comprises on both termini a terminal structural unit derived from a monoisocyanate, wherein m is an integer of 2 or more, n is an integer of 1 or more, m+n is from 3 to 1,500 and m/(m+n) is from {fraction (1/1,500)} to ⅓. The polycarbodiimide is capable of keeping the inherent heat resistance and also showing excellent flexibility. Films and molding materials having high heat resistance and flexibility can be obtained.
Claims5
A polycarbodiimide copolymer which comprises at least one structural unit selected from rubber residues represented by the following formulae (1) and (2) in a number “m”:
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- (wherein each of a, b and c is an integer of from 0 to 200, and X represents an alkylene group having from 0 to 5 carbon atoms) and a structural unit represented by the following formula (3) in a number “n”:
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- (wherein R means an alkyl group having from 4 to 20 carbon atoms or an aryl group) and which comprises on each of the both termini a terminal structural unit derived from a monoisocyanate, wherein m is an integer of 2 or more, n is an integer of 1 or more, m+n is from 3 to 1,500 and m/(m+n) is from {fraction (1/1,500)} to ⅓.
A method for producing a polycarbodiimide copolymer, which comprises allowing at least one bifunctional liquid rubber selected from liquid rubbers having repeating structural units represented by the following formulae (1) and (2):
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- (wherein each of a, b and c is an integer of from 0 to 200, and X represents an alkylene group having from 0 to 5 carbon atoms), an organic diisocyanate and a monoisocyanate to undergo the reaction in an aprotic solvent in the presence of a catalyst.
Dependencies are inferred from the claim text.