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US 9,802,392 B2Granted
Microtextured multilayered elastic laminates with enhanced strength and elasticity and methods of making thereof
AssigneeKimberly-Clark Worldwide, Inc.
InventorsWanDuk Lee, Peiguang Zhou, Davis-Dang Hoang Nhan, Alphonse Carl DeMarco
Life of this patent
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Abstract
Stronger elastic laminates having an improved microtextured appearance, as well as methods of preparing the laminates, are disclosed herein. Particularly, the present disclosure is directed to multilayered elastic laminates including at least one thermoplastic elastomeric film layer and at least one plastic layer coextruded together, stretched and then relaxed. The prepared laminates have enhanced overall strength and elasticity.
Claims20
An elastic laminate comprising:
- a first thermoplastic elastomeric film layer configured to have a permanent set of less than 40% after 150% elongation, wherein the thermoplastic elastomeric film layer comprises greater than 65% by weight polyolefin-based thermoplastic elastomer, a styrenic block copolymer, and from about 3% by weight to about 8% by weight strength-enhancing agent;
- and
- a first plastic layer affixed to a first surface of the thermoplastic elastomeric film layer, the plastic layer having a permanent set greater than the permanent set of the elastomeric film layer, and wherein the plastic layer comprises one of a semi-crystalline and amorphous polymer;
- wherein the laminate is pre-stretched.
1 more element
A method for preparing an elastic laminate, the method comprising:
- coextruding a first thermoplastic elastomeric film layer with a first plastic layer to prepare an elastic laminate, the first thermoplastic film layer configured to have a permanent set of less than 40% after 150% elongation, wherein the thermoplastic elastomeric film layer comprises greater than 65% by weight polyolefin-based thermoplastic elastomer, a styrenic block copolymer, and from about 3% by weight to about 8% by weight strength-enhancing agent;
- the plastic layer having a permanent set greater than the permanent set of the elastomeric film layer, and wherein the plastic layer comprises one of a semi-crystalline or amorphous polymer;
- stretching the elastic laminate in one or both of the machine direction or cross direction;
- and
- relaxing the stretched elastic laminate.
2 more elements
Dependencies are inferred from the claim text.