Abstract:
PROBLEM TO BE SOLVED: To provide a transparent mixture comprising a styrene-butadiene block copolymer and a polystyrene, which has high toughness and excellent transparency even when the polystyrene content in the mixture is relatively high, wherein the above-noted properties have been obtained by avoiding conventional disadvantages. SOLUTION: This mixture comprises a linear block copolymer comprising a vinyl aromatic monomer and a diene, which has structures of (I) S 1 -B 1 -S 2 and (II) B 2 -S 3 , wherein S 1 represents a block comprising a vinyl aromatic monomer having a number average molecular weight (Mn) of in a range of from 40,000 to 100,000 g/mol; S 2 and S 3 respectively represent a block comprising a vinyl aromatic monomer having a number average molecular weight (Mn) of in a range of from 5,000 to 20,000 g/mol; and B 1 and B 2 respectively represent either one or more block comprising a diene, or a block of a copolymer comprising a diene and a vinyl aromatic monomer having a number average molecular weight (Mn) of in a range of from 15,000 to 100,000 g/mol, and wherein the ratio of (I)/(II) in the block copolymer is in a range of from 0.5 to 10. COPYRIGHT: (C)2006,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To provide a transparent impact resistant improved polystyrene with favorable balance in the ratios of toughness and stiffness without conventional drawbacks. SOLUTION: The block copolymer is produced from an aromatic vinyl monomer and contains at least two hard blocks S 1 and S 2 . The block copolymer contains at least one random soft block B/S produced from the aromatic vinyl monomer and a diene between the hard blocks S 1 and S 2 , and contains less than 20% of 1,2-vinyl in the soft block B/S and has the hard block ratios at 51-74 mass% in the total block copolymers without containing a single polymer block B composed of the diene. COPYRIGHT: (C)2004,JPO&NCIPI
Abstract:
The invention relates to a method for producing linear polymers or styrene block-copolymers by anionic polymerisation, wherein the chain-breaking is carried out by an n-alkyl glycidyl ether or a dialkyl ketone.
Abstract:
Multiphase polymer mixtures contain (a) a polymer (A); (b) at least one A-B-C grafted block copolymer (B) made of a block A and a resilient block B that contains a block C as grafted lateral chain, blocks A, B and C differing from each other; and (C) at least one additional polymer (C) different from (A) and (B) and incompatible with polymer (A). Polymer (A) is compatible with block A and incompatible with block C, polymer (C) is compatible with block C and incompatible with block A, the resilient block B has a glass transition temperature below + 20 DEG C and blocks A, B and C are incompatible with each other.
Abstract:
The invention relates to a method for producing linear polymers or styrene block-copolymers by anionic polymerisation, wherein the chain-breaking is carried out by an n-alkyl glycidyl ether or a dialkyl ketone.
Abstract:
Preparation of mineral oil and filler containing homopolymers or copolymers from styrene monomers and/or diene monomers by anionic or radical polymerization comprises adding the additives in filler suspension form in mineral oil.