Process for preparing organic solvent-soluble poly(amide-imide)
AssigneeBridgestone Tire Company Limited
InventorsToshio Yukuta, Takashi Ohashi, Masumi Saito, Katsuhiko Arai
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Abstract
A thermoplastic and organic solvent-soluble poly(amide-imide) elastomer having a number average molecular weight ranging from 10,000 to 100,000, prepared by reacting (1) an acid anhydride functional polymer, represented by the following formula ##STR1## or a mixture of said acid anhydride functional polymer (1) and a tetracarboxylic acid dianhydride, with (2) a dicarboxylic acid dihydrazide in the presence of an aprotic dipolar solvent at a temperature ranging from -10.degree. C to 30.degree. C.
Claims14
A process for producing poly (amide-imide) elastomer having a number average molecular weight ranging from 10,000 to 100,000, which comprises reacting
- (1) an acid anhydride functional polymer represented by the following formula ##STR5## wherein R.sub.1 represents a trivalent hydrocarbon radical having at least 2 carbon atoms and R.sub.2 represents a hydroxyl functional polymer radical having a number average molecular weight ranging from 700 to 10,000 selected from the group consisting of polyether glycol, polyester glycol, polyester ether glycol, poly olefin glycol radicals, and a polyol radical which is obtained by the ozonization of a poly unsaturated hydrocarbon having unsaturated double bond units in the main or side chain, followed by the reduction of the resulting ozonide product with reducing agent,
- with (2) a dicarboxylic acid dihydrazide in the presence of an aprotic dipolar solvent at a temperature ranging from -10.degree. C to 30.degree. C, the equivalent ratio of said acid anhydride functional polymer (1) to said dicarboxylic acid dihydrazide (2) being from 0.95 to 1.05.
A process for producing poly(amide-imide) elastomer having a number average molecular weight ranging from 10,000 to 100,000, which comprises reacting
- (1) a mixture of an acid anhydride functional polymer represented by the following formula ##STR6## wherein R.sub.1 represents a trivalent hydrocarbon radical having at least 2 carbon atoms and R.sub.2 represents a hydroxyl functional polymer radical having a number average molecular weight ranging from 700 to 10,000 selected from the group consisting of polyether glycol, polyester glycol, polyester ether glycol, polyolefin glycol radicals, and a polyol radical which is obtained by the ozonization of a poly unsaturated hydrocarbon having unsaturated double bond units in the main or side chain, followed by the reduction of the resulting ozonide product with reducing agent, and a tetracarboxylic acid dianhydride,
- with (2) a dicarboxylic acid dihydrazide in the presence of an aprotic dipolar solvent at a temperature ranging from -10.degree. C to 3.degree. C, the equivalent ratio of said tetracarboxylic acid dianhydride to said acid anhydride functional polymer (1) being not more than 1.0, and the equivalent ratio of said mixture to said dicarboxylic acid dihydrazide (2) being from 0.95 to 1.05.
Dependencies are inferred from the claim text.