The invention relates to a method for manufacturing a paper substrate suitable for binding silicone in a catalytic hydrosilation reaction and products thereof, wherein the molecular weight of polyvinyl alcohol is used to control the viscosity of the water-based acetalization reaction, such that a paper substrate may be coated with acetalized polyvinyl alcohol that contains high amount of functional vinyl groups, wherein the functional vinyl groups are part of catenated carbon structures which contain at least 4 carbon atoms and which have an acetal connectivity with the backbone chain of the acetalized polyvinyl alcohol.

The invention relates to a method for manufacturing a paper substrate suitable for binding silicone in a catalytic hydrosilation reaction and products thereof, wherein the molecular weight of polyvinyl alcohol is used to control the viscosity of the water-based acetalization reaction, such that a paper substrate may be coated with acetalized polyvinyl alcohol that contains high amount of functional vinyl groups, wherein the functional vinyl groups are part of catenated carbon structures which contain at least 4 carbon atoms and which have an acetal connectivity with the backbone chain of the acetalized polyvinyl alcohol.

A water-absorbent resin containing a vinyl alcohol-based polymer and having a crystal melting enthalpy of more than 0 J/g in a dry state.

A water-absorbent resin containing a vinyl alcohol-based polymer and having a crystal melting enthalpy of more than 0 J/g in a dry state.

The present invention provides a polyvinyl acetal resin that has an excellent dispersing property and enables the production of a formed article having high mechanical strength. Provided is a polyvinyl acetal resin having a water absorption per unit area of 2 mg/cm.sup.2 or greater and 50 mg/cm.sup.2 or less when formed into a film having a thickness of 10 .Math.m.

The present invention provides a polyvinyl acetal resin that has an excellent dispersing property and enables the production of a formed article having high mechanical strength. Provided is a polyvinyl acetal resin having a water absorption per unit area of 2 mg/cm.sup.2 or greater and 50 mg/cm.sup.2 or less when formed into a film having a thickness of 10 .Math.m.

This invention relates to radiopaque polymers and to their use, particularly in the manufacture of medical devices and in methods of medical treatment, including therapeutic embolization. In particular embodiments the present disclosure relates to a hydrophilic polymer comprising pendent groups which a phenyl ring is substituted with one or more iodine groups and one or more non-iodine groups as described in more detail herein.

This invention relates to radiopaque polymers and to their use, particularly in the manufacture of medical devices and in methods of medical treatment, including therapeutic embolization. In particular embodiments the present disclosure relates to a hydrophilic polymer comprising pendent groups which a phenyl ring is substituted with one or more iodine groups and one or more non-iodine groups as described in more detail herein.

The present disclosure relates to radiopaque PVA polymers where the PVA has a first pendant group and a second pendant group, wherein the first pendant group comprises a first phenyl group bearing 1 to 5 iodine atoms, and the second pendant group comprises either (a) a second phenyl group bearing 1 to 3 substituents selected from the group W and optionally 1 to 4 iodine substituents, the group(s) W and the optional iodines being the sole substituents of the second phenyl group. Each W is selected from —OH, —COOH, —SO.sub.3H, —OPO.sub.3H.sub.2, —O—(C.sub.1-4alkyl), —O—(C.sub.1-4alkyl)OH, —O—(C.sub.1-4alkyl)R.sup.2, —O—(C.sub.2H.sub.5O).sub.qR.sup.1—(C═O)—O—C.sub.1-4alkyl and —O—(C═O)C.sub.1-4alkyl; wherein R.sup.1 is H or C.sub.1-4 alkyl; R.sup.2 is —COOH, —SO.sub.3H, or —OPO.sub.3H.sub.2; q is an integer from 1 to 4; wherein the group W may be in the form of a pharmaceutically acceptable salt; or (b) a pyridyl group; which is optionally in the form of a pyridinium ion.

The present disclosure relates to radiopaque PVA polymers where the PVA has a first pendant group and a second pendant group, wherein the first pendant group comprises a first phenyl group bearing 1 to 5 iodine atoms, and the second pendant group comprises either (a) a second phenyl group bearing 1 to 3 substituents selected from the group W and optionally 1 to 4 iodine substituents, the group(s) W and the optional iodines being the sole substituents of the second phenyl group. Each W is selected from —OH, —COOH, —SO.sub.3H, —OPO.sub.3H.sub.2, —O—(C.sub.1-4alkyl), —O—(C.sub.1-4alkyl)OH, —O—(C.sub.1-4alkyl)R.sup.2, —O—(C.sub.2H.sub.5O).sub.qR.sup.1—(C═O)—O—C.sub.1-4alkyl and —O—(C═O)C.sub.1-4alkyl; wherein R.sup.1 is H or C.sub.1-4 alkyl; R.sup.2 is —COOH, —SO.sub.3H, or —OPO.sub.3H.sub.2; q is an integer from 1 to 4; wherein the group W may be in the form of a pharmaceutically acceptable salt; or (b) a pyridyl group; which is optionally in the form of a pyridinium ion.