Thermoplastic hydrogels
First Claim
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1. A thermoplastic hydrophilic polymer having hydroxyl groups and capable of forming a hydrogel, said polymer being a condensation product of (1) a spirolactone of the formula:
- ##STR13## where the total of n and m is 2 to 5 and the total of n'"'"' and m'"'"' is 2 to 5 and the R groups are H or hydrocarbyl with the proviso that not over 3 R groups are hydrocarbyl with (2) a difunctional compound having two groups capable of opening the lactone ring which groups are selected from the group consisting of primary amino, secondary amino, alcoholic hydroxy and phenolic hydroxyl, (1) and (2) being employed in the range of 0.1 to 1 mole of (1) with 1 to 0.1 mole of (2).
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Abstract
Thermoplastic hydrogels are prepared by making condensation polymers of spirolactones of the formula: ##STR1## with a difunctional compound capable of opening the lactone rings. The thermoplastic hydrogels can be cross-linked. In the formula the total of n and m and also of n'"'"' and m'"'"' is 2 to 5 and the R groups are H or hydrocarbyl with not over 3 R groups being hydrocarbyl. Most preferably all R groups are H and n, m, n'"'"' and m'"'"' are all 1.
48 Citations
40 Claims
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1. A thermoplastic hydrophilic polymer having hydroxyl groups and capable of forming a hydrogel, said polymer being a condensation product of (1) a spirolactone of the formula:
- ##STR13## where the total of n and m is 2 to 5 and the total of n'"'"' and m'"'"' is 2 to 5 and the R groups are H or hydrocarbyl with the proviso that not over 3 R groups are hydrocarbyl with (2) a difunctional compound having two groups capable of opening the lactone ring which groups are selected from the group consisting of primary amino, secondary amino, alcoholic hydroxy and phenolic hydroxyl, (1) and (2) being employed in the range of 0.1 to 1 mole of (1) with 1 to 0.1 mole of (2).
- View Dependent Claims (2, 3, 4, 5, 6, 23, 24, 25, 39, 40)
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7. A crosslinked thermoplastic polymer prepared by crosslinking a thermoplastic hydrophilic polymer having hydroxyl groups and capable of forming a hydrogel, said polymer being a condensation product of (1) a spirolactone of the formula:
- ##STR14## where the total of n and m is to 2 to 5 and the total of n'"'"' and m'"'"' is 2 to 5 and the R groups are H or hydrocarbyl with the proviso that not over 3 R groups are hydrocarbyl with (2) a difunctional compound capable of opening the lactone ring having two groups capable of opening the lactone ring which groups are selected from the group consisting of primary amino, secondary amino, alcoholic hydroxy and phenolic hydroxyl with a compound containing at least two functional groups capable of reacting with alcoholic hydroxyl groups, the amount of crosslinking agent being insufficient to destroy the hydrogel forming properties of the polymer.
- View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 33, 34)
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26. A polymer capable of forming a hydrogel, said polymer containing the repeating unit:
- ##STR15## where the R groups are H or hydrocarbyl with the proviso that not over 3 R groups are hydrocarbyl, the total of n + m is 2 to 5, the total of n'"'"' + m'"'"' is 2 to 5, R'"'"' is alkylene, alkylidene, cycloalkylene or arylene, A is --O--, --NH-- or ##STR16## where R'"'"' is alkyl, aryl or cycloalkyl and x is the number of units in the polymer.
- View Dependent Claims (27, 28, 29, 30, 31, 32)
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35. A hydrogel of a thermoplastic hydrophilic polymer having hydroxyl groups and capable of forming a hydrogel, said polymer being a condensation product of (1) a spirolactone of the formula:
- ##STR20## where the total of n and m is 2 to 5 and the total of n'"'"' and m'"'"' is 2 to 5 and the R groups are H or hydrocarbyl with the proviso that not over 3 R groups are hydrocarbyl with (2) a difunctional compound capable of opening the lactone ring having two groups capable of opening the lactone ring which groups are selected from the group consisting of primary amino, secondary amino, alcoholic hydroxy and phenolic hydroxyl.
- View Dependent Claims (36, 37, 38)
Specification