Transition metal compound, polymerization-initiator system comprising the same, and process for producing polymer
申请人:Uemura Makoto
公开号:US20070270521A1
公开(公告)日:2007-11-22
A transition metal compound represented by the formula, [(CpR
1
m
)(CO)
2
M
1
][M
2
(CO)
2
(CpR
2
n
)], wherein Cp is a cyclopentadienyl ring, R
1
and R
2
are independently of each other a hydrocarbyl group having 1 to 20 carbon atoms, and each of at least one R
1
and at least one R
2
is a hydrocarbyl group having 5 to 20 carbon atoms, m and n are independently of each other an integer of 1 to 5, and M
1
and M
2
are independently of each other a transition metal atom of the group 8 in the periodic table of elements; a polymerization-initiator system comprising said transition metal compound; and a process for producing a polymer in the presence of the polymerization-initiator system.
PHOTOSENSITIVE RESIN COMPOSITION AND FLEXOGRAPHIC RESIN PLATE
申请人:TOKYO OHKA KOGYO CO., LTD.
公开号:EP0950923A1
公开(公告)日:1999-10-20
The present invention provides a photosensitive resin composition which comprises an urethane resin obtained by reacting (A) a carboxyl group-containing polymer having an acid value of 30 mg KOH/g or more and a glass transition temperature of 30°C or more, (B) a compound having two isocyanate groups in one molecule, (C) a compound having two hydroxyl groups in one molecule and (D) a photopolymerizable unsaturated monomer having one hydroxyl group in one molecule, and a photopolymerization initiator, and a resin plate for flexography using the photosensitive resin composition, whereby the photosensitive resin composition having water developing properties, high in sensitivity and impact resilience, and excellent in water resistance, ink resistance and press life of a hardened portion forming a line pattern area of a printing plate material and the resin plate for flexography prepared by the use of the photosensitive resin composition can be provided.
ELASTOMER COMPOSITION AND THERMOPLASTIC RESIN COMPOSITION CONTAINING THE SAME
申请人:KANEKA CORPORATION
公开号:EP1179566A1
公开(公告)日:2002-02-13
There is provided an elastomer composition for an impact modifier and a thermoplastic resin composition having improved impact resistance using the same. An elastomer composition comprises a block copolymer (a) containing a methacrylate polymer and a siloxane polymer, and a graft copolymer (b) containing a polymer component having a glass transition temperature of lower than 25°C. And the composition is mixed with a thermoplastic resin (c).
A thermoplastic resin composition comprising a thermoplastic resin (a) and a block copolymer (b) containing a methacrylic polymer block (A) and an acrylic polymer block (B).
The present invention relates to a block copolymer (A) including a (meth)acrylic polymer block (a) and an acrylic polymer block (b). The (meth)acrylic polymer block (a) is preferably copolymerized with a monomer having a functional group having high cohesive force, such as a carboxyl group, so that the 5%-weight-loss temperature is 300°C or more or the tensile strength is 3 MPa or more, and the hardness measured by a type A durometer according to JIS K6253 is 50 or less, and a compression set measured after 22 hours at 70°C is 45% or less. The block copolymer (A) exhibits excellent thermal decomposition resistance and low compression set at high temperatures. The block copolymer (A) can be used as a soft material for automobile, and has low hardness, high adhesion, high oil resistance, high weather resistance, high heat resistance, high recycling property, high tensile properties; and high wax remover resistance.
本发明涉及一种嵌段共聚物(A),包括(甲基)丙烯酸聚合物嵌段(a)和丙烯酸聚合物嵌段(b)。(甲基)丙烯酸聚合物嵌段(a)最好与具有高内聚力官能团(如羧基)的单体共聚,从而使 5%失重温度为 300°C 或以上,或拉伸强度为 3 MPa 或以上,且根据 JIS K6253 用 A 型硬度计测量的硬度为 50 或以下,在 70°C 下 22 小时后测量的压缩永久变形为 45% 或以下。嵌段共聚物(A)具有优异的抗热分解性能,高温下的压缩永久变形小。嵌段共聚物(A)可用作汽车软质材料,具有低硬度、高附着力、高耐油性、高耐候性、高耐热性、高回收性、高拉伸性和高抗脱蜡性。