Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Patent
1980-11-10
1982-08-03
Schofer, Joseph L.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
525298, 525902, 526 87, 5262325, 5263285, 524833, C08L 0000
Patent
active
043426760
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to the production of latices of reactive rubbers, and more particularly to a method for producing latices of copolymers of butyl acrylate and 1-methacrylate-1-tert-butyl peroxy ethane. Said compounds can be used to obtain shockproof weather-resistant copolymers and graft comb-shaped styrene copolymers as well. Moreover, the reactive alkyl acrylate rubbers may find extensive application in the production of oil- and ozone-resistant vulcanized rubbers, the vulcanization of the rubbers can therewith be carried out with no special vulcanizing agents added.
BACKGROUND OF THE INVENTION
Known in the art is a method for producing reactive peroxidized copolymers by means of mass copolymerization or suspension copolymerization of vinyl monomers with perester acrylates (cf. USSR Inventor's Certificate No. 170,675 published in Bulletin "Otkrytia, izobretenia, promyshlennye obraztsy i tovarnye znaki", No 9, 1965, p. 69). According to this method, 1-10% of monomeric peroxide is added to vinyl monomer and the reaction mixture is heated in autoclaves at a temperature ranging from 40.degree. to 100.degree. C. The copolymer formed comprises 0.1-3% of the peroxidic groups. The copolymers obtained according to this method have low reactivity due to a small content of the peroxidic groups therein because of their decomposition during synthesis of the copolymers. In further use of said copolymers to obtain graft copolymers, their low reactivity fails to provide the grafting extent required.
Also known in the art is a method for producing reactive latices by means of copolymerization of vinyl monomers with butyl-2-acrylate-ethyl peroxide (cf. a paper by Puchin V. A. et al. Syntaz perekisnosoderzhashikh divinylstyrolnikh sopolymerof v emulsiyakh. Visokomoleculijrnie soedineniij. AII, 1969, No. 4, pp. 789-793). By this method, the copolymerization of vinyl monomers with peroxidic monomer (in amount of 1-5 mole, %) is carried out in an emulsion stabilized with ammonium cetyl trimethyl bromide at temperatures of from 10.degree. to 50.degree. C. The copolymer formed comprises 0.1-2% of the peroxidic units.
The copolymers obtained according to this method have low reactivity due to a small content of the peroxidic groups in the copolymers.
Known in the art is a method for producing latices of reactive alkyl acrylate rubbers by means of emulsion copolymerization of alkyl acrylate with a bifunctional acrylic monomer, such as .beta.-chloroethyl methacrylate or glycidyl methacrylate (cf. USSR Inventor's Certificate No. 254,770 published in Bulletin "Otkrytia, izobretenia, promyshlennye obraztsy i tovarnye znaki", No. 32, 1969, p. 81). Copolymerization of styrene, butyl acrylate and .beta.-chloroethyl methacrylate is carried out in emulsion at a ratio of the water phase to the hydrocarbon phase of 2:1 or 4:1, in the presence of an emulsifier, such as sodium alkyl sulfonate, and a redox system at a reaction temperature of from 30.degree. to 70.degree. C. In 2-2.5 hours, conversion of the monomers amounts to 95-98%.
Introduction of .beta.-chloroethyl methacrylate units into macrochains of the butyl acrylate rubber causes rapid aging of these rubbers. According to this method, grafting to the butyl acrylate rubber containing chlorine atoms occurs due to the chain transfer reaction as a result of the separation of the chlorine atom. However, low efficiency of this reaction results in inadequate grafting of vinyl monomers to the butyl acrylate rubber.
There is known a method for producing latices of alkyl acrylate rubbers used primarily in synthesizing shock-proof copolymers based on vinyl monomers (cf. USSR Inventor's Certificate No. 447,050 published in Bulletin "Otkrytia, izobretenia, promyshlennye obraztsy i tovarnye znaki", No. 31, 1976, p. 177). By this method, rubber latices are prepared by emulsion copolymerization of acrylic monomers with 1-(.alpha.-alkyl acrylate)-1-tertbutyl peroxy ethanes in the presence of water soluble emulsifiers and a reversible initiating redox system con
REFERENCES:
patent: 3242121 (1966-03-01), Hill, Jr.
patent: 3297666 (1967-01-01), MacPherson
patent: 3745196 (1973-07-01), Lane et al.
patent: 4045463 (1977-08-01), Matsuyama et al.
Ivanchev Sergei S.
Pavljuchenko Valery N.
Pessina Zinaida M.
Vasilieva Elena D.
Lipman Bernard
Schofer Joseph L.
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