Degradable breathable multilayer film with improved properties and method of making same
AssigneeKimberly-Clark Worldwide, Inc.
InventorsVasily Topolkaraev, Patrick Downey
Life of this patent
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Abstract
A multilayer film includes a plastic layer and an elastomeric layer. The plastic layer can contain a co-polyester of terepthalic acid, adipic acid and butanediol, and the elastomeric layer can contain a polyurethane elastomer. The plastic layer and/or the elastomeric layer can contain filler particles, and may be present as a bilayer laminate. The plastic layer and a filled elastomeric layer can also be combined with an unfilled elastomeric layer to form a tri-layer laminate. The multilayer films can provide breathable films with improved degradability, stretchability and recoverability, and tactile feel.
Claims25
A multilayer film, comprising:
- a plastic layer comprising a co-polyester of terepthalic acid, adipic acid and butanediol;
- and
- an elastomeric layer comprising a polyurethane elastomer,
- wherein the plastic layer and the elastomeric layer together form a bilayer laminate.
A method of making a multilayer film, comprising:
- extruding a plastic layer comprising a co-polyester of terepthalic acid, adipic acid and butanediol;
- extruding an elastomeric layer comprising a polyurethane elastomer;
- combining the plastic layer and the elastomeric layer in a multilayer combining block to form a laminate;
- separating the laminate to form a pair of laminate halves each including a portion of the plastic layer and a portion of the elastomeric layer;
- stretching the laminate halves to thin and widen the laminate halves;
- stacking the laminate halves to reform another laminate having alternating plastic and elastomeric layers in parallel stacking arrangement;
- repeating the separating, stretching and stacking to form a multilayer structure having a plurality of alternating plastic and elastomeric layers in parallel stacking arrangement;
- and
- allowing the multilayer structure to solidify into a multilayer film.
Dependencies are inferred from the claim text.