Polycarbonate resin composition stabilized against radiation
申请人:MITSUBISHI ENGINEERING-PLASTICS CORPORATION
公开号:EP0794218A2
公开(公告)日:1997-09-10
The present invention relates to a polycarbonate resin composition comprising 100 parts by weight of a polycarbonate resin; 0.01 to 5 parts by weight of a compound containing oxymethylene unit, a compound containing oxymethylene unit having substituent or a cyclic ether compound having substituent.
Preparation of hydrophilic coatings utilizing a 1,3-dioxolane compound
申请人:Coloplast A/S
公开号:EP2156852A1
公开(公告)日:2010-02-24
A method for the preparation of a package comprising a packing means holding a medical device element of a substrate polymer, said substrate polymer having on at least a part of the surface thereof a hydrophilic coating, wherein the hydrophilic coating has been applied to the surface of said substrate polymer in the form of a solution of a hydrophilic polymer selected from the groups consisting of polyvinylpyrrolidone and polyethylene oxide in a vehicle comprising an optionally substituted 1,3-dioxolane compound, followed by evaporation of at least part of the vehicle and arranging said medical device element having the coating of the non-cross-linked hydrophilic polymer within a packing means, and sealing said packing means.
A thermoplastic resin composition comprising:
a transparent aromatic thermoplastic resin (a) and
a copolyester resin (b) comprising at least two kinds of dicarboxylic acid moieties and one kind of diol moiety, 1 to 50 mol % of the dicarboxylic acid moieties being a naphthalenedicarboxylic acid moiety,
the ratio of (a) to the combined amount of (a) and (b) being 55 to 99.99% by weight, and the ratio of (b) being 0.01 to 45% by weight.
Process and catalyst for making dialkyl carbonates
申请人:CATALYTIC DISTILLATION TECHNOLOGIES
公开号:US20020082439A1
公开(公告)日:2002-06-27
A process for producing dialkyl carbonates, such as dimethyl carbonate, from the reaction of a primary alcohol with urea in the presence of a catalyst which is a complex compound represented by R
2
Sn(OCH
3
)
2
·&khgr;L, wherein R=C
n
H
2n+1
, n=1 to 12, &khgr;=1 or 2, and L is oxygen atom containing organic complexing agent which is carried out by conducting the reaction continuously under reactive distillation conditions wherein the product DMC is stripped from the reaction mixture with methanol and further including the recovery of product dimethyl carbonate (DMC) made in the process by contacting a stream containing the DMC, such as a azeotropic mixture with methanol, with diethyl oxylate under conditions of extractive distillation to selectively separate the DMC from methanol.
一种利用伯醇与脲在催化剂存在下反应制取碳酸二甲酯等二烷基碳酸盐的工艺,催化剂是由 R
2
Sn(OCH
3
)
2
-&khgr;L,其中 R=C
n
H
2n+1
n=1 to 12, &khgr;=1或2,L为含氧原子的有机络合剂,该反应是在反应蒸馏条件下连续进行的,其中产物DMC用甲醇从反应混合物中剥离,还包括回收工艺中制成的产物碳酸二甲酯(DMC),方法是在萃取蒸馏条件下,将含有DMC的液流(如与甲醇的共沸混合物)与草酸二乙酯接触,选择性地从甲醇中分离出DMC。
HOUGHTON R. P.; MORGAN A. D., J. CHEM. SOC. PERKIN TRANS., PART 1, 1980, NO 3 756-758