Aqueous synthetic resin dispersions

Details Aqueous synthetic resin dispersions Aqueous synthetic resin dispersions

1991-10-15

1993-09-14

Schofer, Joseph L.

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

Synthetic resins

Processes of preparing a desired or intentional composition...

524501, 524506, 524533, 524730, 4272071, C08K 515, C09J 1106

Patent

active

052449505

DESCRIPTION:

BRIEF SUMMARY
The present invention relates to aqueous synthetic resin dispersions consisting of radical solution polymerization, carried out spatially separately and/or in succession but spatially at the same point, of from 15 to 70 parts by weight of a monomer mixture Al and from 30 to 85 parts by weight of a monomer mixture A2, composed of .alpha.,.beta.-monoethylenically unsaturated mono- and/or dicarboxylic acids of 3 to 5 carbon atoms, anhydrides of these dicarboxylic acids or half-esters of these dicarboxylic acids with alkanols of 1 to 8 carbon atoms or glycol monoethers (monomers I), methacrylates of C.sub.1 -C.sub.10 -alkanols (monomers II), of C.sub.11 -C.sub.20 -alkanols (monomers III), IV), formula I (monomers V) ##STR1## where n is from 1 to 8, R.sup.1 and R.sup.2 are each hydrogen and/or C.sub.1 -C.sub.14 -alkyl and R.sup.3, R.sup.4 and R.sup.5 are each C.sub.1 -C.sub.6 -alkyl and/or C.sub.1 -C.sub.6 alkoxy, with the proviso that one or more of the radicals R.sup.3 to R.sup.5 is alkoxy, (monomers VI), is accounted for by monomers II whose homopolymers have a glass transition temperature of from 0.degree. to -70.degree. C., and an amount of monomers V which differs from. 0, more silanes of the general formula II ##STR2## where R.sup.6 is an epoxy-carrying radical, (C) effective amounts of ammonia and/or of an organic amine
The present invention furthermore relates to the preparation of such synthetic resin dispersions and the use of films thereof as contact adhesives for self-adhesive articles.
Aqueous synthetic resin dispersions whose films are suitable as contact adhesives are usually prepared by the method of free radical emulsion polymerization using hydrophilic assistant systems (emulsifiers and/or protective colloids) which, inter alia, ensure a sufficient shelf life of the dispersion. However, these hydrophilic assistants remain in the resulting adhesive film during film formation by the dispersions and have an adverse effect on its water resistance. Inter alia, the adhesive films exhibit blooming on contact with water, which is particularly disadvantageous in the case of self-adhesive transparent films.
DE-A 37 20 860 discloses aqueous polymer dispersions which have a long shelf life and are obtainable by subsequent dispersion of a mixture of two copolymers in water with the addition of ammonia and polyhydrazides, one or both of the copolymers containing a carbonyl compound as copolymerized unit. The films of these dispersions are recommended as contact adhesives having high water resistance. However, the disadvantage of these contact adhesives is that they contain polyhydrazides, which frequently release hydrazine in an undesirable manner under the action of water.
It is an object of the present invention to provide aqueous synthetic resin dispersions which have a long shelf life and whose films do not have the stated disadvantage and in particular are suitable as contact adhesives having high water resistance.
We have found that this object is achieved by the synthetic resin dispersions defined at the outset.
Particularly suitable monomers I are the monocarboxylic acids acrylic and methacrylic acid, the dicarboxylic acids maleic and itaconic acid, the anhydrides of these dicarboxylic acids and half-esters thereof with the alcohols ethanol, isopropanol, n-butanol and glycol mono-n-butyl ether, among which acrylic and methacrylic acid are preferred. The amount of the monomers I in the monomer mixture A1 is advantageously from 5 to 12% by weight. The half-esters of the dicarboxylic acids can also be introduced into the synthetic resins A in an indirect manner by reacting associated anhydride-containing synthetic resins A in solution in an organic solvent at elevated temperatures of from 50.degree. to 100.degree. C. with the corresponding alcohols. Particularly suitable monomers II are methyl acrylate, methyl methacrylate, ethyl acrylate, isopropyl acrylate, n-butyl acrylate, n-butyl methacrylate, isobutyl acrylate, isobutyl methacrylate, tert-butyl acrylate, 2-ethylhexyl acrylate and 2-ethylhexyl me

REFERENCES:
patent: 4057527 (1977-11-01), Columbus
patent: 4077932 (1978-03-01), Columbus
patent: 4097643 (1978-06-01), Hasegawa
patent: 4961967 (1990-10-01), Pladdemann
Patent Abstracts of Japan, Band 13, Nr. 278 (c-611)(3636), Jun. 25, 1989, & JP, A, 175577 (Toyo Ink Mfg Co. Ltd.) Mar. 22, 1989.
Patent Abstracts of Japan, Band 10, Nr. 148 (C-350) (2205), May 29, 1986, & JP, A, 617369 (Toyo Ink Seizo K.K.) Jan. 14, 1986.

Affiliated with

Also associated with

Rating

Aqueous synthetic resin dispersions does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Aqueous synthetic resin dispersions, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Aqueous synthetic resin dispersions will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2027105