Copolymerizate solutions based on addition products of .alpha.,.beta.-unsaturated carboxylic acids with glycidyl esters and of .alpha.,.beta.-unsaturated monomers which can be copolymerized with them
AssigneeSynthopol Chemie Dr. rer. pol. Koch GmbH & Co., KG
InventorHorst Dalibor
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Abstract
Copolymerizate solutions are disclosed containing copolymerizates based on addition products of an .alpha.,.beta.-unsaturated carboxylic acid with a glycidyl ester and copolymerizable .alpha.,.beta.-unsaturated monomers with and without hydroxyl groups which are present after the copolymerization with unusually high solid matter content (approximately 78-83% by weight solid matter) and which can be reacted with polyisocyanates to form reaction lacquers with a high solid matter content with good processing viscosity. These lacquers are especially well suited for automobile finishes.
Claims32
A method of preparing a copolymerizate solution which comprises inert organic solvents and a copolymerizate based on an addition product of an .alpha.,.beta.-unsaturated acid with a glycidyl ester and copolymerizable .alpha.,.beta.-unsaturated monomers with or without hydroxyl groups, wherein said copolymerizate solution comprises the components:
- A) 15-50% by weight of inert organic solvent,
- B) 50-85% by weight of a hydroxyl-group-containing copolymerizate wherein said copolymerizate is obtained by means of simultaneous addition esterification and polymerization in an inert organic solvent or mixtures thereof which exhibit a boiling range between 160.degree. C. to 200.degree. C. and by heating under reflux cooling in the presence of a polymerization initiator, of
- a) 20 to 30% by weight glycidyl ester of .alpha.-alkylalkane monocarboxylic acids and/or .alpha.,.alpha.-dialkylalkane monocarboxylic acids,
- b) 8 to 12% by weight methacrylic acid,
- c) 15 to 27% by weight hydroxyalkylmethacrylate with 1 to 6 C atoms in the hydroxyalkyl group,
- d) 30 to 53% by weight styrene,
- e) 1 to 5% by weight polypropylene glycol monomethacrylate with an average molecular weight of 350 to 387, and
- f) 0 to 20% by weight alkylmethacrylate with 1 to 8 C atoms in the alkyl group;
- the sum of the components is 100% by weight in each instance;
- wherein components c) and e) are different, said method comprising heating from 160.degree. to 195.degree. said inert solvent and said glycidyl ester of .alpha.-alkylalkane monocarboxylic acids and/or .alpha.,.alpha.-dialkylalkane monocarboxylic acids;
- subsequently adding monomers (a), (b), (c), (d), (e) and optionally (f) of component A, and optionally adding a polymerization initiator, a chain-transfer agent and a carboxy-epoxy catalyst, over a period of 12 to 20 hours;
- and subsequently maintaining the temperature from 160.degree. to 195.degree. for 2 to 5 hours to thereby form the solution of said copolymerizate.
Dependencies are inferred from the claim text.