Pure polyurethane condom having adhesive layer, and preparation method therefor
AssigneeReckitt Benckiser Health Limited
InventorsJiabing Dai, Weihu Li, Linlin Feng, Liang Chen
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Abstract
Disclosed in the present disclosure are a pure polyurethane condom having an adhesive layer, and a method for preparing the condom. The pure polyurethane condom having an adhesive layer at least comprises: a first polyurethane film layer; a polyurethane adhesive layer on the first polyurethane film layer; and a second polyurethane film layer on the polyurethane adhesive layer, wherein the 100% tensile modulus of the polyurethane adhesive layer is 2.5 N/mm2 or lower, and the structures of the first polyurethane film layer and the second polyurethane film layer are different from that of the polyurethane adhesive layer.
Claims18
A pure polyurethane condom having an adhesive layer, comprising:
- a first polyurethane film layer;
- a polyurethane adhesive layer on the first polyurethane film layer, wherein the polyurethane adhesive layer has a 100% tensile modulus of 2.5 N/mm2 or lower;
- a second polyurethane film layer on the polyurethane adhesive layer;
- and
- a third polyurethane film layer on the second polyurethane film layer;
- and
- wherein the first polyurethane film layer and the second polyurethane film layer each have a structure different from that of the polyurethane adhesive layer, and wherein the third polyurethane film layer has a structure different from that of the second polyurethane film layer.
A method for preparing a pure polyurethane condom having an adhesive layer, comprising the steps of:
- dipping in a first polyurethane resin and drying, to form a first polyurethane film layer;
- dipping in a polyurethane adhesive layer resin and drying, to form a polyurethane adhesive layer on the first polyurethane film layer;
- dipping in a second polyurethane resin and drying, to form a second polyurethane film layer on the polyurethane adhesive layer;
- dipping in a release agent to apply it on the second polyurethane film layer, followed by drying, demolding, and electrical testing to obtain the polyurethane condom;
- wherein the polyurethane adhesive layer has a 100% tensile modulus of 2.5 N/mm2 or lower, and the first polyurethane film layer and the second polyurethane film layer each have a structure different from that of the polyurethane adhesive layer.
A pure polyurethane condom having an adhesive layer, comprising:
- a first polyurethane film layer;
- a first polyurethane adhesive layer on the first polyurethane film layer;
- a second polyurethane film layer on the first polyurethane adhesive layer;
- a second polyurethane adhesive layer on the second polyurethane film layer;
- a third polyurethane film layer on the second polyurethane adhesive layer;
- and
- a fourth polyurethane film layer on the third polyurethane film layer,
- wherein the first polyurethane film layer, the second polyurethane film layer, and the fourth polyurethane film layer each have a structure different from that of the first polyurethane adhesive layer;
- wherein the first polyurethane adhesive layer and the second polyurethane adhesive layer have the same structure, and have a 100% tensile modulus of 2.5 N/mm2 or lower;
- the first polyurethane film layer and the third polyurethane film layer have the same structure, and have an elongation at break of 500% or more;
- wherein the second polyurethane film layer has a 100% tensile modulus of 3.5 N/mm2 or lower;
- and
- wherein the fourth polyurethane film layer has a burst volume of SL or more when it is formed into a condom of 10-25 μm.
Dependencies are inferred from the claim text.