Patent GB-1050133-A (GB)
IPC: C08F8/00
Abstract: 1,050,133. Treating chlorine-containing polymers. DEUTSCHE GOLDUND SILBERSCHETDEANSTALT VORMALS ROESSLER. Feb. 27, 1964 [Feb. 27. 1963], No. 8242/64. Heading C3P. Shaped structures are prepared from compositions of vinyl and/or vinylidene chloride polymers by a process which comprises treating the composition before, during or after shaping with polyfunctional cross-linking agents and stabilizing agents, which compositions can be cross-linked to a degree which as a function of (a) the concentration C of reactive groups in the cross-linking and stabilizing agents taken together, (b) the kneading time to the stability limit γ determined from a Brabender plastogram and (c) the treatment temperature T lies within a space in a three-dimensional, rectangular system of co-ordinates from (a), (b) and (c) defined by the following three co-ordinates :-(x) concentration C within the limits C 1  = 2 and C 2  = 140 mVal/100 gm. of vinyl chloride units and C 1  = 1À3 and C 2  = 126 mVal/100 gm. of vinylidene chloride units in the composition, (y) time γ the negative logarithm of the reciprocal of the time γ within the limits 0À4712 and 3À2553 and (z) the temperature T within the limits T 1  = 140‹ C. and T 2  = 220‹ C. The polymers may be copolymers of vinyl and/or vinylidene chloride with other vinyl or vinylidene halides, unsaturated alcohols or esters or ethers thereof, unsaturated ketones, conjugated dienes, olefinically unsaturated hydrocarbons and unsaturated acids, esters and nitriles; and other polymers, e.g. polyolefins, polystyrene, polyesters, polyamides, natural and synthetic rubbers, silicone rubbers and aldehyde and ketone resins, may also be present. Many suitable cross-linking agents are listed including primary-secondary and basic oligoammonium phosphites and thiophosphites, amine and oligoammonium salts of phosphonous acids, hypophosphorous acid esters, phosphinic acid esters, pyrophosphorous acids and esters, mercapto imidazoles, polyvalent metal oxides, and metal soaps. Conventional fillers, pigments, dyestuffs and plasticizers may also be present, and the compositions may be used to form films and coatings, sheets, shaped articles, tubes, hollow bodies, profiled strips, tyre inner tubes, shoe soles and acid resistant baths. In examples compositions of polyvinyl chloride and dioctyl adipate are cross-linked and stabilized with (1) neutral and secondary dipropylene triammonium phosphite together with (3) zinc oxide, (2) primary and secondary tetraethylene pentammonium phosphite, (4) secondary 1,6- hexamethylene diammonium phosphite and magnesium oxide, (5) 1,4-tetramethylene diammonium phosphite and magnesium oxide, (6) primary 1,6-hexamethylene diammonium phosphite and magnesium oxide, (7) primary 1,6- hexamethylene diammonium phosphite and tribasic lead maleate, (8) secondary 1,3-propylene diammonium phosphite and tribasic lead maleate, (9) bis[3-aminopropyl][(2-amino-2- ethyl)-propyl] ether phosphite and magnesium oxide, (10) dipropylene triamine and dibutyl phosphite, (11) cyclohexyl propylene diamine, triphenyl phosphite and magnesium oxide, (12) 1,6-hexamethylene diamine and thioacetamide and (13) epoxidized vegetable oil, benzyl octyl adipate, carbon black, dipropylene triammonium phosphite and magnesium oxide.