Novel polyacetal copolymers of trioxane and trimethylolpropane formal derivatives
AssigneeHoechst Celanese Corporation
InventorsJerry A. Broussard, Andrew B. Auerbach, Nan L. Yang, James L. Paul, Yong C. Zheng, Chong L. Zhang
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Abstract
Cationic copolymerization of trioxane and trimethylolpropane (TMP) formal or its ester derivatives yields acetal copolymers having pendant functional groups. The TMP formal or ester derivatives of TMP formal may therefore include functional groups selected from hydroxyl or ester moieties which are protected and thus survive the copolymerization with trioxane. These groups may then be present as functional reactive sites for the subsequent synthesis of block copolymers and/or to chemically bind modifiers to the acetal copolymer backbone, for example.
Claims17
As essentially linear acetal copolymer of the formula:
- ##STR4## where X is an ester radical or a hydroxyl radical obtained by hydrolyzing an ester radical, and m and n are each integers such that m+n is between 5 to 20000, and the mole ratio of units of subscript n to the units of subscript m is between about 1:5000 to 1:1, and wherein said acetal copolymer is the reaction product of trioxane and an ester derivative of trimethylolpropane formal.
An essentially linear acetal copolymer comprised of the reaction product of trioxane and an ester derivative of trimethylolpropane formal, said copolymer having a ratio of units derived from said ester derivative of trimethylolpropane formal to units derived from trioxane of between 1:5000 1:1, and having a molecular weight of up to about 500,000, thermal stability in excess of 200.degree. C., and greater than about 40% crystallinity.
A method of making as essentially linear acetal copolymer comprising polymerizing, under acetal copolymer polymerization conditions, trioxane and an ester derivative of trimethylolpropane formal.
A method of making an essentially linear acetal copolymer of the formula:
- ##STR7## where X is an ester radical, and m and n are each integers such that m+n is between 5 to 20000, and the mole ratio of units of subscript n to the units of subscript m is between about 1:5000 to 1:1, which method comprises cationically copolymerizing trioxane and an ester derivative of trimethylolpropane formal of the formula:
- ##STR8## where X is an ester radical.
Dependencies are inferred from the claim text.