Abstract Grafted polymers of vinyl chloride are prepared by polymerizing or copolymerizing vinyl chloride in the presence of an ethylene backbone polymer composed of polyethylene an ethylene copolymer or mixture thereof which has a fusion index < OR = 250, from 0.2 to 4 double bonds per 1000 carbon atoms and/or from 5 to 30 methyl groups per 1,000 carbon atoms, under a partial pressure of vinyl chloride which is lower at all times during the polymerization than the saturated vapor pressure of vinyl chloride at the temperature of polymerization. Homogeneous products having a high degree of grafting and excellent thermal resistance and which provide in combination with polymers of vinyl chloride, compositions having improved resistance to shock, excellent transparency and processibility, are obtained by this process.
Process for obtaining grafted polymers of vinyl chloride in accordance with claim 1 in which the fusion index of the polymer of ethylene is between 0.1 and 0.3.
Claim 2
Dependent Claim
28 words
Process for obtaining grafted polymers of vinyl chloride in accordance with claim 1 in which the fusion index of the polymer of ethylene is between 0.3 and 40.
Claim 3
Dependent Claim
28 words
Process for obtaining grafted polymers of vinyl chloride in accordance with claim 1 in which the fusion index of the polymer of ethylene is between 40 and 200.
Claim 4
Dependent Claim
27 words
Process for obtaining grafted polymers of vinyl chloride in accordance with claim 1 in which the polymerization is carried out at a temperature of 80* to 110*C.
Claim 5
Dependent Claim
23 words
Process in accordance with claim 1 in which the backbone polymer is in the form of granules, powder, fluff, fibers, plates or films.
Claim 6
Dependent Claim
29 words
Process in accordance with claim 1 in which additional vinyl chloride is introduced during the course of the polymerization reaction either in a continuous manner or in successive portions.
Claim 7
Dependent Claim
22 words
Process in accordance with claim 1 in which the polymerization is carried out in bulk, in the absence of a liquid phase.
Claim 8
Dependent Claim
22 words
Process in accordance with claim 1 in which the polymerization is carried out in the presence of a stabilizer of poly(vinyl chloride).
Claim 9
Dependent Claim
24 words
Process in accordance with claim 1 in which the polymerization is carried out in an aqueous suspension in the presence of a suspension agent.
Claim 10
Dependent Claim
17 words
A process in accordance with claim 1 in which siad polymerization is carried out in aqueous suspension.