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:
The invention relates to a mixture, comprising a) 5 to 50 wt. % of a block copolymer (A), with one or more block copolymers (B/S)A, each made from 65 to 95 wt. % vinylaromatic monomers and 35 to 5 wt. % dienes with a glass transition temperature TgA in the range 40~ to 90 ~C, b) 95 to 50 wt. % of a block copolymer B, with at least one hard block (S) made from vinylaromatic monomers and one or more copolymer blocks (B/S)B, each made from 20 to 60 wt. % vinylaromatic monomers and 80 to 40 wt. % dienes and a glass temperature TgB in the range -70~ to 0 ~C, c) 0 to 45 wt. % of a block copolymer (C) different from (A) and (B), or polystyrol and d) 0 to 6 wt. % of a plastifier and the use thereof for the production of shrink films.
Abstract:
Mixture (A) comprises linear block copolymers of vinyl aromatic monomers and diene structural units, and the ratio of (I)/(II) amounts to 0.5-10. Mixture (A) comprises linear block copolymers of vinyl aromatic monomers and diene structural units of formula (S 1-B 1-S 2 (I) and B 2-S 3 (II)) and the ratio of (I)/(II) amounts to 0.5-10. S 1blocks of vinyl aromatic monomers with an average molecular mass of 40000-100000 g/mol; S 2, S 3blocks of vinyl aromatic monomers with an average molecular mass of 5000-20000 g/mol; and B 1, B 2one or more blocks of diene or copolymer blocks of diene and vinyl aromatic monomers with an average molecular mass of 15000-100000. Independent claims are also included for: (1) a mixture obtained by partial or complete hydrogenation of the linear block copolymers of vinyl aromatic monomers and diene structural units; and (2) the preparation of (A).
Abstract:
PCT No. PCT/EP95/02110 Sec. 371 Date Dec. 4, 1996 Sec. 102(e) Date Dec. 4, 1996 PCT Filed Jun. 3, 1995 PCT Pub. No. WO95/33793 PCT Pub. Date Dec. 14, 1995Transparent molded articles having a high-contrast laser inscription thereon are produced from a polymer mixture consisting of A) from 40 to 99% by weight of a polymer of an alkyl ester of (meth)acrylic acid, B) from 1 to 50% by weight of a copolymer of styrene and acrylonitrile having an acrylonitrile content of from 8 to 30% by weight, C) from 0 to 50% by weight of rubber particles, and D) from 0 to 20% by weight of additives and processing auxiliaries, by preparing a transparent molded article from the polymer mixture, and exposing the transparent molded article to laser radiation.
Abstract:
A mixture which comprises from 5 to 50% by weight of a block copolymer A, which comprises one or more copolymer blocks (B/S)A each composed of from 65 to 95% by weight of vinylaromatic monomers and from 35 to 5% by weight of dienes and of a glass transition temperature TgA in the range from 40° to 90° C.; from 95 to 50% by weight of a block copolymer B, which comprises at least one hard block S composed of vinylaromatic monomers and comprises one or more copolymer blocks (B/S)B each composed of from 20 to 60% by weight of vinylaromatic monomers and from 80 to 40% by weight of dienes and of a glass transition temperature TgB in the range from −70° to 0° C.; from 0 to 45% by weight of polystyrene or of a block copolymer C other than A and B; and from 0 to 6% by weight of a plasticizer; and its use for production of shrink films.
Abstract:
Una mezcla que comprende a) de 5 a 50% en peso de un copolimero de bloques A el cual comprende uno o mas bloques (B/S)A de copolimeros cada uno compuesto de desde 65 a 95% en peso de monomeros vinilaromaticos y de 35 a 5% en peso de dienos y de una temperatura de transicion vitrea TgA en el rango de 40 degree a 90 degree C, b) de 95 a 50% en peso de un copolimero de bloques B el cual comprende al menos un bloque S duro compuesto de monomeros vinilaromaticos y comprende uno o mas bloques (B/S)B de copolimeros cada uno compuesto de 20 a 60% en peso de monomeros vinilaromaticos y de 80 a 40% en peso de dienos y de una temperatura de transicion vitrea TgB en el rango de -70 degree a 0 degree C, c) de 0 a 45% en peso de poliestireno o de un copolimero de bloques C diferente al A y B, y d) de 0 a 6% en peso de un plastificante. y sus usos para la produccion de peliculas de contraccion.
Abstract:
A process for increasing the tension crack resistance of polystyrene molding compositions by mixing with an elastomer based on styrene (S-TPE) is new. Independent claims are also included for the following: (1) a polystyrene molding material containing (wt.%): smooth impact tough polystyrene (MIPS) of surface gloss more than 40%, as measured at a measurement angle of 60 degrees in accordance with DIN 67530,or a mixture of this with standard polystyrene (GPPS); (2) a laminated plate or film containing a substrate layer of amorphous polystyrene and a top layer consisting of the polystyrene molding composition; and (3) a process for preparation of cooling unit mold parts by means of a polystyrene molding composition using the above laminate or film.
Abstract:
Mixture (I) comprises 35-95 wt.% styrol polymer (a) (acrylonitrile butadiene styrol polymer, acrylonitrile styrol acrylic ester polymer, or standard- or impact-resistant polystyrol); 1-10 wt.% of styrol butadiene block copolymer (b) consisting of at least two polystyrol blocks S and at least one styrol butadiene copolymer block S/B; and 4-55 wt.% of an inorganic filler (c). Independent claims are also included for: (1) foam materials obtained from (I) by adding a chemical or physical propellant and subsequently foaming.