Polyester type block copolymer composition
AssigneeToyo Boseki Kabushiki Kaisha
InventorsTakuma Kobayashi, Hironobu Kitagawa, Shigeo Kobayashi
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Abstract
An improved polyester type block copolymer composition having a rubber-like elasticity, particularly having excellent heat resistance and water resistance, which comprises a polyester type block copolymer produced from a crystalline aromatic polyester and a lactone in melt-admixture with at least one epoxy compound and optionally further with a carboxylic acid compound selected from an ethylene-carboxylic acid copolymer and an aliphatic carboxylic acid metal salt.
Claims2
A polyester type block copolymer which comprises a polyester type block copolymer obtained from a crystalline aromatic polyester and a lactone in the ratio of 95/5 to 30/70 by weight, in melt-admixture with at least one epoxy compound, said epoxy compound being incorporated in an amount of 0.1 to 20% by weight based on the weight of the polyester type block copolymer, said epoxy compound being a member selected from the group consisting of mono-, di- and tri-functional epoxy compounds of the formula:
- ##STR3## wherein R.sub.1 is a hydrocarbon group having 1 to 10 carbon atoms, R.sub.2 is an alkylene group having 1 to 4 carbon atoms, R.sub.3 is a divalent hydrocarbon group having 1 to 20 carbon atoms or --(R.sub.2 O)m--R.sub.2 --, R.sub.4 is a trivalent hydrocarbon group having 3 to 20 carbon atoms, and m is an integer of 0 to 20.
Dependencies are inferred from the claim text.