1,3-Dioxan-2-one, 5,5-dimethyl-, polymer with 1,3-dioxan-2-one 127475-72-3 5,5-Dimethyl-1,3-dioxan-2-one polymer with 1,3-dioxan-2-one Dimethyltrimethylene carbonate-trimethylene carbonate copolymer Dmtmc-tmc copolymer