Block copolymer
AssigneeAsahi Kasei Kabushiki Kaisha
InventorsMasaaki Aramaki, Takashi Saitou, Tomofumi Maekawa
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Abstract
Block copolymer comprising at least two kinds of polymer components each having a different structural unit in the polymer selected from polyamide, polyester, polycarbonate and polyarylate. The present block copolymer has a distinguished moldability and can be produced even from rework products or recycle products in a simple and economical manner.
Claims18
A block copolymer, which comprises at least two kinds of polymer components each having a different structural unit in the polymer, where the polymer components are selected from the group consisting of polyamide, polyester, polycarbonate and polyarylate, Y given by the following formula (1) is 0.1-0.9:
- 5 Y = 1 m ∑ j = 1 m | Tg j - X Tg j ( A ) - X |
- (wherein m is the number of glass transition temperatures of the block copolymer, Tgj is the glass transition temperature (° C.) of the block copolymer, Tg(A)j is the glass transition temperature (° C.) of the polymer component nearest to Tgj among the glass transition temperatures of the polymer components, and X is given by the following formula (2):
- 6 X = ∑ i = 1 n Tg ( B ) iw i
- wherein n is the number of polymer components, Tg(B)i is the glass transition temperatures (° C.) of the individual polymer components and wi is the weight ratios of the individual polymer components).
A process for producing a block copolymer, which comprises melt kneading (A) at least two kinds of polymer components each having a different structural unit in the polymer and selected from the group consisting of polyamide, polyester, polycarbonate and polyarylate, with (B) a phosphite ester compound and (C) a phosphite metal salt.
Dependencies are inferred from the claim text.