Branched acrylate copolymer with polymerizable double bonds and

Details Branched acrylate copolymer with polymerizable double bonds and Branched acrylate copolymer with polymerizable double bonds and

1989-09-28

1993-07-13

Seidleck, James J.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525302, 525303, 525304, 525309, 428483, 428500, 10628724, C08F26506, C08F26504, B32B 2730, C09D13308

Patent

active

052274322

DESCRIPTION:

BRIEF SUMMARY
The invention relates to a method for the production of a coating means containing an acrylate copolymer with free polymerizable double bonds.
From DE-OS 33 19 061 an acrylate copolymer with free double bonds is known which is produced by transesterification of the methyl ester component of a copolymer of acrylates and methacrylates with a polyol acrylate or polyol methacrylate. The means are used in particular for the impregnation of soft material flat gaskets for combustion engines. The cross-linkage of the means takes place in the presence of heat with the addition or peroxides or by means of high-energy electron beam over the free double bonds of the methacrylate or acrylate.
Cross-linkage over the free double bonds, however, does not proceed optimally and hence the desire for a composition which readily and rapidly cures without splitting off substances with are questionable in terms of toxicology and which has good properties with respect to resistance to solvents and chemicals.
From DE-A-34 00 966 substances curable in atmospheric oxygen are known which are produced by the conversion of hydroxyl and possibly epoxy groups-containing copolymers with monocarboxylic acids with 12 to 26 C atoms and at least one olefinic unsaturated double bond. For the formation of the copolymer no monomers with more than one double bond for each molecule are used. The described substances can be processed without solvents. They are used as curable sealing substances.
From EP-A-158 161 hydroxyl group-containing acrylate copolymers are known which are produced by the copolymerization of 3 to 25 percent by weight, relative to the combined weight of all monomers, monomers having at least two polymerizable olefinic unsaturated double bonds.
By using these multiply functional monomers a branching of the acrylate copolymer is achieved. According to EP-A-158 161 the described hydroxyl groups-containing acrylate copolymers are cross-linked with melamine formaldehyde resins or with polyisocyanates. The obtained coatings have good properties with respect to resistance to chemicals and solvents. Of disadvantage, however, are the substances used for cross-linking, which from the point of view of toxicology are not quite harmless since they can split off undesirable substances. The described substances are in particular suitable for varnishwork in connection with motor vehicle repairs.
The problem on which the invention is founded is solved by a method for the production of a coating material containing an acrylate copolymer with free double bonds, which is producible in a two-stage method, characterized in that in a first stage a pre-crosslinked non-gelled acrylate copolymer (A) is produced by the copolymerization of two polymerizable double bonds, is 100 percent by weight, in an organic solvent at 70.degree. to 130.degree. C., preferable at 90.degree. to 120.degree. C., using initiators and at least 0.5 percent by weight, preferable at least 2.5 percent by weight relative to the total weight of the monomers, of a polymerization regulator, and that in a second stage the resulting polymer (A) is converted with compounds which, apart from a group able to react with the functional groups of (b) of the polymer (A), contain at least one ethylenic unsaturated polymerizable double bond.
As component a) advantageously compounds of the general formula ##STR1## with R=H or CH.sub.3,
Examples of such compounds are hexanediol diacrylate, hexanediol dimethacrylate, glycol diacrylate, glycol dimethacrylate, butanediol diacrylate, butanediol dimethacrylate, trimethylolpropane triacrylate, and trimethylolpropane trimethacrylate. It is understood, that also combinations of these multiply unsaturated monomers can be used. Furthermore, divinyl benzene is also suitable as component a).
The component a) can furthermore advantageously be a conversion product of a carboxylic acid having a polymerizable olefinic unsaturated double bond and glycidyl acrylate and/or glycidyl methacrylate or a polycarboxylic acid esterified with an unsaturated alcohol or unsa

REFERENCES:
patent: 4037038 (1977-07-01), Tsuchiya
patent: 4067825 (1978-01-01), Hradil
patent: 5115064 (1992-05-01), Jung et al.
Translation of German Patent 3400966 published Jul. 1985.

Affiliated with

Also associated with

Rating

Branched acrylate copolymer with polymerizable double bonds and does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Branched acrylate copolymer with polymerizable double bonds and , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Branched acrylate copolymer with polymerizable double bonds and will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2312575