Patent GB-913861-A (GB)
Title: Flame-resistant polyester resinous compositions
IPC: C08G63/682
Filed: 1960-07-14
Abstract: A flame-resistant composition comprises a polymerizable mixture of (i) a monomer containing the CH2=C= group and (ii) a polyester containing halogen atoms and derived from at least one polyhydric alcohol and at least one olefinically unsaturated polycarboxylic acid and which has incorporated therein by condensation a compound of the formula <FORM:0913861/IV(a)/1> or <FORM:0913861/IV(a)/2> wherein each of R to R5 contains at most 20 carbon atoms and R is a saturated or unsaturated aliphatic hydrocarbon radical or a cycloalkyl, aralkyl, hydroxyalkyl, or halogenated alkyl, cycloalkyl or aralkyl radical; R1 and R2 are each a hydrogen or halogen atom or an alkyl or cycloalkyl radical; and R3, R4 and R5 are each a saturated or unsaturated aliphatic hydrocarbon radical or a cycloalkyl or halogenated alkyl, cycloalkyl or aralkyl radical-(see Group p  IV(b)).  The polyester may also contain saturated aliphatic or aromatic dicarboxylic acid units.  Several suitable polyhydric alcohols and saturated and unsaturated dicarboxylic acids are listed, many containing bromine or chlorine atoms.  The polycondensation is effected by conventional methods, preferably with about 10 molar per cent excess hydroxyl equivalents at 150 DEG  to 230 DEG C. under nitrogen or carbon dioxide.  The phosphorus compound may be incorporated in amounts yielding 0,5 to 5 wt. per cent phosphorus in the final copolymerized product (corresponding to 10 to 100 wt. per cent phosphorus compound based on the polyester).  It may be introduced before, during, or preferably at the end of the polyesterification.  Monomers (i) specified are styrene, methyl styrene, divinyl benzene, vinyl toluene, diallyl phthalate, triallyl cyanurate, vinyl acetate, acrylic acid or methacrylic acid esters, nuclear halogenated styrenes, tetrachlorophthalic acid diallyl ester, pentachlorophenyl acrylate and trichloroacetic acid allyl ester. Polymerization catalysts specified are benzoyl, MEK, t-butyl, and p-chlorobenzoyl peroxides, cumene hydroperoxide, azodiisobutyronitrile and cold-hardening systems such as a peroxide in combination with tertiary amines such as triethylamine or diethylaniline, substituted hydrazines, or cobalt octoate or naphthenate.  Hydroquinone or quinhydrone may be used as inhibitor.  The compositions may be used either for the production of moulded articles or coatings or as impregnating material or, in combination with fillers or fibrous materials, such as glass fibres, jute, asbestos or synthetic fibres, for the production of laminates.  Specification 766,722 is referred to.ALSO:Compounds of the formula <FORM:0913861/IV (b)/1> or <FORM:0913861/IV (b)/2> wherein each of R to R5 contains at most 20 carbon atoms and R is a saturated or unsaturated aliphatic hydrocarbon radical or a cycloalkyl, aralkyl, hydroxyalkyl, or halogenated alkyl, cycloalkyl or aralkyl radical; R1 and R2 are each a hydrogen or halogen atom or an alkyl or cycloalkyl radical; and R3, R4 and R5 are each a saturated or unsaturated aliphatic hydrocarbon radical or a cycloalkyl or halogenated alkyl, cycloalkyl or aralkyl radical-are obtained by reacting a compound of the formula <FORM:0913861/IV (b)/3> with (1) a semiester of an a ,b -unsaturated dicarboxylic acid or (2) an a ,b -unsaturated monocarboxylic acid. They are used as components of unsaturated polyester resins (see Group IV(a)). Specification 766,722 is referred to.