Low Tg non-crystalline acetal copolymers
AssigneeHoechst Celanese Corporation
InventorsGeorge L. Collins, Paul Zema, William M. Pleban
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Abstract
Low Tg copolymers of trioxane and 1,3-dioxolane which have a dioxolane content greater than 65 mol percent and less than about 75 mol percent and an IV of from about 1.0 to about 2.3, and which are non-crystalline at room temperature or above, are disclosed. These polymers, when blended with crystalline oxymethylene polymers, improve the latter's impact properties. They can also be used as adhesives for crystalline oxymethylene polymers.
Claims21
A low Tg non-crystalline copolymer of trioxane and 1,3-dioxolane having a 1,3-dioxolane content greater than 65 mol percent and less than about 75 mol percent, said percentages being based on the total mols of trioxane and 1,3-dioxolane present in said copolymer, and an intrinsic viscosity of from about 1.0 to about 2.3.
A blend of:
- (a) a low Tg non-crystalline copolymer of trioxane and 1,3-dioxolane having a 1,3-dioxolane content greater than 65 mol percent and less than about 75 mol percent, said percentages being based on the total mols of trioxane and 1,3-dioxolane present in said copolymer, and an intrinsic viscosity of from about 1.0 to about 2.3, and
- (b) a crystalline oxymethylene polymer.
Dependencies are inferred from the claim text.