【発明の名称】カルボキシル基含有共重合体の製法

Japanese Patent JPH082932

B2

PCT No. PCT/EP90/00878 Sec. 371 Date Dec. 5, 1991 Sec. 102(e) Date Dec. 5, 1991 PCT Filed Jun. 2, 1990 PCT Pub. No. WO90/15086 PCT Pub. Date Dec. 13, 1990.The invention relates to copolymers containing carboxyl groups and having an acid number of 20 to 150 mg of KOH/g and a number average molecular weight of 2000 to 8000, which can preferably be prepared from copolymers containing hydroxyl groups by reaction with carboxylic anhydrides, to a process for their preparation and their use in coating agents. The copolymers contain a vinyl ester, a vinyl aromatic, a hydroxyalkyl ester of an (alpha),(beta)-unsaturated carboxylic acid, and optionally other monomers that may contain acid groups. The vinyl ester is taken initially and the other monomers are metered during the course of a monomer addition time of equal length for all monomers, in the following manner: 1) the amount of the hydroxyalkyl ester added per time unit remains constant, and 2) the amount of the vinyl aromatic added within the first third of the monomer addition time is 15 to 30% by weight, that added within the second third is 25 to 40% by weight, and that added within the last third is 35 to 60% by weight, in each case relative to the total amount of vinyl aromatic.

HOFUMAN PEETAA
YUNGU UERUNAA ARUFUONSU

JP50836490A

January 17, 1996

June 02, 1990

Click for automatic bibliography generation  

BEE AA ESU EFU RATSUKE UNTO FUARUBEN AG

C08F2/00; C08F2/04; C08F2/06; C08F8/00; C08F8/46; C08F18/02; C08F212/04; C08F20/26; C08F212/00; C08F218/10; C08F220/04; C08F220/06; C08F220/28; C09D131/02; C09D133/06; C08L63/00; (IPC1-7): C08F212/04; C08F2/00; C08F2/06; C08F218/10; C08F220/06; C08F220/28

Toshio Yano (2 outside)

Next Patent: CHAMFERING OF GLASS SUBSTRATE