Pumpable expandable sealant useful in vehicles
AssigneeHenkel AG & Co. KGaA
InventorsNeil R. Wilson, Hiroko Okuno Mattice, Girdhari Kumar, Kristen Louise Johns, Alexandria Sarah Corbin, Paul D. Zeits, Gail M. Henning, Pravin V. Patel
Life of this patent
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Abstract
Disclosed are pumpable expandable compositions useful in sealing cavities in vehicles, and methods of applying the compositions which significantly improve vertical and inverted sag resistance without detracting from performance; compositions of the invention and methods of applying them provide greater versatility in sealing larger gaps and cavities due to improved expansion height.
Claims20
A pumpable thermally expandable sealant composition comprising:
- synthetic rubber, a PVC homopolymer or copolymer;
- a wax thixotropic agent;
- a blowing agent;
- a liquid rubber optionally functionalized;
- a vulcanizing agent, a vulcanization accelerator;
- and one or more fillers.
A pumpable thermally expandible sealant composition comprising:
- a. SBR Rubber present in an amount ranging from 5-30 wt. %;
- b. PVC homopolymer/copolymer and/or Acrylic resin powder optionally having a Tg in a range of 50° C. to 120° C. present in an amount ranging from 2-35 wt. %;
- c. Amide wax thixotropic agent optionally having a melting point range from 80 C to 150° C., present in an amount ranging from 0.25 wt. % to 5 wt. %;
- d. Blowing Agent present in an amount ranging from 0.5 wt. % to about 15 wt. %;
- e. Liquid rubber, optionally functionalized with anhydride, epoxy and/or acid functional groups, said liquid rubber being present in an amount ranging from 0.25-20 wt. %;
- f. Sulfur, present in an amount of about 0.1 wt. % to about 4 wt. %;
- g. Sulfur crosslink accelerators, present in an amount ranging from 0.25-about 4 wt. %;
- h. Plasticizer present in an amount of about 15-55 wt. %;
- i. Filler present in an amount of about 1 to 25 wt. %;
- j. Antioxidant, optionally having a melting point greater than 100° C., present in an amount ranging from 0.25-1.25 wt. %;
- k. Optionally comprising one or more of fumed silica, a peroxide curing agent;
- and a co-crosslinking agent, which may each independently be present in an amount of up to 2.0 wt. %;
- wherein all amounts are based upon a total amount of the composition.
An article of manufacture comprising:
- a part having a metal surface, a composite material surface or a combination of said surfaces;
- and deposited on a portion of said surfaces, an uncured, heat expandable sealant comprising:
- SBR rubber;
- a PVC homopolymer/copolymer and/or acrylic resin;
- an amide wax;
- a blowing agent;
- a liquid rubber functionalized with maleic anhydride, epoxy or acid function groups;
- vulcanizing agent, comprising sulfur;
- one or more vulcanization accelerators, and at least one filler;
- wherein the sealant is curable within a target bake condition of 15 minutes at 140° C. metal temperature to exhibit a cohesive failure mode of at least 80%.
Dependencies are inferred from the claim text.