Neue Mischpolymere und Verfahren zu ihrer Herstellung

摘要

A polymer consisting mainly of recurring oxymethylene units, and also containing at least 0,1% of recurring oxyalkylene or substituted oxyalkylene units each containing two or more adjacent carbon atoms, is obtained by copolymerizing trioxane and a cyclic ether containing two or more adjacent carbon atoms. The copolymerization is carried out in the presence of a boron fluoride co-ordination complex with an organic compound in which oxygen is the donor atom. The copolymer may contain up to 15% of the oxyalkylene units. The thermal stability of the copolymer may be improved by reacting it with a isocyanate. In examples, copolymers are obtained by copolymerizing trioxane with ethylene oxide, dioxolane, neopentyl formal or pentaerythritol diformal, and in some instances the copolymers are reacted with toluene-2, 4-di-isocyanate. Other cyclic ethers and isocyanates are mentioned. Specification 877,820 is referred to.