US 12,472,091 B2
Composite polyurethane condom and preparation method thereof
Jiabing Dai, Lanzhou (CN); Weihu Li, Lanzhou (CN); Linlin Feng, Lanzhou (CN); and Liang Chen, Lanzhou (CN)
Assigned to Reckitt Benckiser Health Limited, (GB)
Filed by Reckitt Benckiser Health Limited, Slough (GB)
Filed on Oct. 6, 2021, as Appl. No. 17/495,572.
Prior Publication US 2023/0107662 A1, Apr. 6, 2023
Int. Cl. A61F 6/04 (2006.01); B29C 41/42 (2006.01); C09J 175/06 (2006.01); C09J 175/08 (2006.01)
CPC A61F 6/04 (2013.01) [B29C 41/42 (2013.01); C09J 175/06 (2013.01); C09J 175/08 (2013.01); C08G 2170/00 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A composite polyurethane condom comprising:
a first substrate layer;
an adhesive layer formed on the first substrate layer; and
a second substrate layer formed on the adhesive layer;
wherein the adhesive layer comprises an aliphatic sulfonated waterborne polyurethane, the aliphatic sulfonated waterborne polyurethane comprising amino groups, sulfonic groups and carboxyl groups in its molecular chain;
wherein the aliphatic sulfonated waterborne polyurethane comprises a polyether/polyester polyol, an aliphatic diisocyanate, a crosslinking agent, and a hydrophilic chain extender;
wherein the aliphatic diisocyanate is selected from the group consisting of hexamethylene diisocyanate, isophorone diisocyanate, dicyclohexylmethane-4,4′-diisocyanate, and combinations thereof; and
wherein the adhesive layer has an elongation at break greater than or equal to 500%.