Sealant composition, article and method
Assignee3M Innovative Properties Company
InventorsStefan Weigl, Gertrud A. Klein, Shuichi Kitano, Kotaro Shinozaki, Tomohiro Koiwa, Kazuyoshi Shiozaki
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Abstract
A composition comprises a curable epoxy-containing material, a first thermoplastic polyurethane component, a curative for the epoxy-containing material, and optionally, a second thermoplastic polyurethane component that is different than the first thermoplastic polyurethane component. The compositions are useful for sealing discontinuities in a substrate surface, especially those found in motor vehicles. Sealant articles and methods of sealing discontinuities are also disclosed.
Claims17
A sealant article comprising:
- a) a layer of a sealant composition comprising:
- i) a curable epoxy-containing material;
- ii) a first thermoplastic polyurethane component that is the polymerization product of a polymerizable mixture comprising a polyisocyanate and a polytetramethylene oxide polyol;
- iii) a curative for-the epoxy-containing material;
- and
- iv) optionally, a second thermoplastic polyurethane component that is different than the first thermoplastic polyurethane component;
- wherein the composition provides a melt-flowable sealant for sealing discontinuities in the surface of a substrate;
- and
- b) another layer attached to the sealant composition layer of part a) which other layer is selected from the group consisting of:
- woven webs, non-woven webs, scrims, and metal caps.
A composition comprising:
- a) a curable epoxy-containing material;
- b) a first thermoplastic polyurethane component;
- c) a curative for the epoxy-containing material;
- and
- d) a second thermoplastic polyurethane component that is different than the first thermoplastic polyurethane component;
- wherein components (a), (b) and (d) display only a single-phase upon melt blending, but the composition is phase-separated after curing;
- said composition being characterized by both polyether and polyester thermoplastic polyurethanes being used in which the weight ratio of polyether polyurethane to polyester lethane is greater than 1.
An article comprising a surface having a discontinuity formed thereon, and a layer of a sealant article comprising:
- a) a layer of a sealant composition comprising:
- i) a curable epoxy-containing material;
- ii) a first thermoplastic polyurethane component that is the polymerization product of a polymerizable mixture comprising a polyisocyanate and a polytetramethylene oxide polyol;
- iii) a curative for the epoxy-containing material;
- and
- iv) optionally, a second thermoplastic polyurethane component that is different than the first thermoplastic polyurethane component;
- wherein the composition provides a melt-flowable sealant for sealing discontinuities in the surface of a substrate;
- and
- b) another layer attached to the sealant composition layer of part a) which other layer is selected from the group consisting of:
- woven webs, non-woven webs, scrims, thermoplastic film, metal caps and plastic caps, the sealant composition of which has been cured and which seals the discontinuity.
A method of sealing a discontinuity in the surface of a substrate, the method comprising the steps of:
- a) placing over the discontinuity, a sealant composition comprising
- i) a curable epoxy-containing material;
- ii) a first thermoplastic polyurethane component that is the polymerization product of a polymerizable mixture comprising a polyisocyanate and a polytetramethylene oxide polyol;
- iii) a curative for the epoxy-containing material;
- and
- iv) optionally, a second thermoplastic polyurethane component different from the first thermoplastic polyurethane component;
- b) heating the sealant composition to cause the composition to flow and seal the discontinuity;
- and allowing the sealant composition to cool.
Dependencies are inferred from the claim text.