摘要：

Resins derived from monomers containing the group CH2 = C < are plasticized by admixing therewith solid linear lactone polymers consisting essentially of recurring units of formula <FORM:1000402/C3/1> The resins may be polymers of vinyl halides' vinyl esters, vinyl ketones, vinyl thioethers, vinyl aromatic compounds, acrylic compounds, vinyl sulphones, sulphoxides and sulphonates, and vinyl heterocyclic compounds, many suitable polymers and copolymers being specified. The lactone polymers may be derived from delta-valerolactones, oxa-delta-valerolactones, epsilon-caprolactones and oxa-epsilon-caprolactones, zeta-enantholactones and oxa-zeta-enantholactones and mixtures thereof, many suitable polyesters being listed. Examples describe plasticizing polyvinyl chloride with polyesters derived from (1, 3, 15 to 20 and 36) poly epsilon caprolactone; (2, 4 to 7, 21 to 26, 31 to 35 and 37 to 40) copolymers of epsilon caprolactone and methyl epsilon caprolactones; (8) polymethyl epsilon caprolactones; (9 to 11) copolymers of epsilon caprolactone and delta valerolactone; and (12 to 14) copolymers of epsilon caprolactone and 2-keto-1,4-dioxane. Specifications 973,905, 981,199 and 1,000,401 are referred to.

展开