Patent ES-214559-A1 (ES)
Title: Stabilization of mixtures of unsaturated polyesters and copolymerizable monomers by means of hydroxy substituted benzophenones
IPC: C08K5/132
Filed: 1954-04-03
Abstract: Benzophenones having the general formula <FORM:0789070/IV (b)/1> wherein R is an alkyl group having from 1 to 4 carbon atoms, X is a hydrogen or halogen atom, or an alkyl or alkoxy group having from 1 to 4 carbon atoms and Y is a hydroxyl group, a halogen atom or an alkyl or alkoxy group having 1 to 4 carbon atoms are prepared by effecting a condensation reaction in the presence of a catalyst, preferably anhydrous aluminium chloride between a disubstituted benzene having the formula <FORM:0789070/IV (b)/2> with a disubstituted benzoyl halide having the formula <FORM:0789070/IV (b)/3> wherein R, X and Y have the meanings given above and R1 is H or an alkyl, and if R1 is an alkyl group, effecting dealkylation of the product. The products are employed in the production of light-stable resins (see Group IV (a)). Reference has been directed by the Comptroller to Specification 706,151.ALSO:A polymerizable composition adapted to produce light-stable resins on polymerizing comprises one or more unsaturated polyester resins and one or more compounds containing a polymerizable CH2=C < group, e.g. styrene or a substituted styrene or an allyl compound, and is characterized by the inclusion of one or more benzophenones having the general formula <FORM:0789070/IV (a)/1> wherein R is an alkyl group having from 1 to 4 carbon atoms, X is a hydrogen or halogen atom or an alkyl or alkoxy group having from 1 to 4 carbon atoms and Y is a hydroxyl group, a halogen atom or an alkyl or alkoxy group having from 1 to 4 carbon atoms (see Group IV (b)). A further polymerizable composition comprising one or more monomeric vinyl compounds is characterized by containing one or more benzophenones of the above formula and in a modification thereof the vinyl compound is polymerized prior to the addition of the benzophenone compound. A polymerization catalyst is employed, e.g. a peroxide, and to effect low temperature polymerization a promoter is employed, e.g. mercaptans, alkyl substituted anilines and metallic salt driers, e.g. cobalt naphthenate, generally dispersed in a suitable solvent, e.g. the monomeric polymerizable material. In examples: Gels are obtained at room and elevated temperatures from a mixture comprising a polyester from phthalic anhydride, fumaric acid and propylene glycol, adding styrene and ditertiary butyl hydroquinone, lauryl mercaptan, methyl ethyl ketone peroxide and 2 - hydroxy - 4 - methoxy 2 - chlorobenzophenone, the substituted benzophenone being omitted in a comparative test (1) and (8) 2,4-dihydroxybenzophenone is employed in further comparative tests (1A 8A) in similar processes are employed 2-hydroxy-4-methoxy-41-butylbenzophenone (2) 2-hydroxy-4-methoxy-41-chlorobenzo-phenone (3) 2-hydroxy-4,41-dimethoxybenzophenone (4) 2 - hydroxy - 4 - methoxy - 41 - tertiary - butyl benzophenone (5) cobalt naphthenate is employed in a process similar to (1) in place of lauryl mercaptan in styrene (6) comparative Example 1A is similarly modified (6A) sheets are prepared on a hot mill roll from a mixture of polyvinyl chloride resin, di-2-ethyl hexyl phthalate and 2 - hydroxy - 4,41 - dimethoxy benzophenone (8) and 2,21 - dihydroxy - 4,41 - dimethoxy benzophenone (9). The products are subjected to light treatment and control experiments in which no substituted benzophenone is employed are described. Reference has been directed by the Comptroller to Specification 706,151.