Compositions and articles containing polymeric vinyl aromatic aminimides
AssigneePolaroid Corporation
InventorsHenry S. Kolesinski, Lloyd D. Taylor
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Abstract
Compositions and articles containing polymeric vinyl aromatic aminimides are disclosed. The polymeric vinyl aromatic aminimides exhibit unusual rheological properties in an aqueous medium. The polymers provide thermoreversible gelling properties and exhibit negative thixotropy.
Claims11
An aqueous polymeric composition exhibiting thermoreversible gel forming properties comprising an aqueous medium having therein, at a weight concentration of from 4% to 10%, a polymeric vinyl aromatic aminimide comprising repeating units of the formula ##STR4## wherein R is hydrogen, methyl or halogen;
- n is zero or one;
- and each of R.sup.1, R.sup.2 and R.sup.3 is alkyl, aryl, aralkyl or alkaryl, or two of R.sup.1, R.sup.2 and R.sup.3, together with the nitrogen atom to which they are bonded, complete a heterocyclic ring.
An aqueous polymeric composition exhibiting negative thixotropic properties comprising an aqueous medium having therein, at a concentration in the range of about 1% to about 3% by weight, a polymeric vinyl aromatic aminimide comprising repeating units of the formula ##STR5## wherein R is hydrogen, methyl or halogen;
- n is zero or one;
- and each of R.sup.1, R.sup.2 and R.sup.3 is alkyl, aryl, aralkyl or alkaryl, or two of R.sup.1, R.sup.2 and R.sup.3, together with the nitrogen atom to which they are bonded, complete a heterocyclic ring.
An article comprising a support sheet carrying a layer of thermoreversible gel, the gel comprising a medium of water and having therein, at a concentration in the range of from 4% to 10%, a polymeric vinyl aromatic aminimide comprising repeating units of the formula ##STR6## wherein R is hydrogen, methyl or halogen;
- n is zero or one;
- and each of R.sup.1, R.sup.2 and R.sup.3 is alkyl, aryl, aralkyl or alkaryl, or two of R.sup.1, R.sup.2 and R.sup.3, together with the nitrogen atom to which they are bonded, complete a heterocyclic ring.
An article comprising a polymeric support sheet carrying a polymeric gel layer, the gel layer comprising a medium of water and having therein, at a concentration in the range of from 4% to about 10%, a polymeric vinyl aromatic aminimide comprising repeating units of the formula ##STR7## wherein each of R.sup.1, R.sup.2 and R.sup.3 is alkyl.
Dependencies are inferred from the claim text.