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US 4,233,436 AGranted
Block polymers of hydroxyalkyl phthalate esters and tetrahydrofuran/alkylene oxide copolymers
AssigneeE. I. Du Pont de Nemours and Company
InventorIvan M. Robinson
Life of this patent
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Abstract
Block polymers containing an hydroxyalkyl phthalate ester as one of the constituent blocks and a copolymer of tetrahydrofuran and one or more alkylene oxides as one or more of the other constituent blocks are useful in preparing polyurethanes and polyesters.
Claims14
A linear hydroxyl-terminated block polymer represented by the structure
- A--B
- or
- A--B--A
- wherein the A block is a copolymer of THF and one or more alkylene oxides, containing two or three carbon atoms in its oxide ring which block constitutes 30-99% of the weight of the total polymer, and the B block is represented by the structure ##STR10## wherein R is --CH.sub.2 --.sub.2-6 ##STR11## where R.sub.1 and R.sub.2 can be the same or different and can be hydrogen or a linear or branched alkyl radical of 1-6 carbon atoms and
- X is hydrogen when the block polymer is in the A--B configuration, and absent when the block polymer is in the A--B--A configuration, which block constitutes 1-70% of the weight of the total polymer,
- the polymer having a number average molecular weight of 500-20,000.
3 more elements
Dependencies are inferred from the claim text.