Non-drying sealer composition

Abstract
The present invention provides a non-drying sealer composition which does not substantially swell or shrink non-polar vulcanized rubber products. The non-drying sealer composition is suitable for sealing a gap between a sheet-metal flange and the inside of a trim part by charging the composition into the trim part of the weatherstrip for an automobile. The non-drying sealer composition comprises liquid rubber as a sealer base, a tackifier and a thixotropic agent as auxiliary materials, and a non-volatile softener (including a plasticizer) as a dispersing medium. As the non-volatile softer, a shrinking component is used alone or in combination with a swelling component. Thus the swelling action of the sealer composition against the non-polar vulcanized rubber product reaches within about .+-.5% in terms of the degree of swelling.
Claims.
1. A non-drying sealer composition applied to a non-polar vulcanized rubber product, comprising: a liquid rubber as a sealer base, a tackifier and a thixotropic agent as auxiliary materials, and a non-volatile softener including a plasticizer as a dispersing medium; wherein as the non-volatile softener, a shrinking component is used alone or in combination with a swelling component, whereby the swelling action of the sealer composition against the non-polar vulcanized rubber product reaches within about .+-.5% in terms of the degree of swelling, and wherein the shrinking component is a polyether polyol.
2. The non-drying sealer composition according to claim 1, wherein the swelling action of the sealer composition against the non-polar vulcanized rubber product reaches within about 0% in terms of the degree of swelling.
3. The non-drying sealer composition according to claim 1, wherein the shrinking component is trifunctional polypropylene glycol.
4. The non-drying sealer composition according to claim 3, wherein the liquid rubber is liquid NBR, and the swelling component used in the non-volatile softener is a diphthalate-based plasticizer and/or process oil.
5. The non-drying sealer composition according to claim 4, wherein the thixotropic agent is calcium carbonate powder.
6. The non-drying sealer composition according to claim 3, wherein the thixotropic agent is calcium carbonate powder.
7. The non-drying sealer composition according to claim 1, wherein the liquid rubber is liquid NBR, and the swelling component used in the non-volatile softener is a diphthalate-based plasticizer and/or process oil.
8. The non-drying sealer composition according to claim 7, wherein the thixotropic agent is calcium carbonate powder.
9. The non-drying sealer composition according to claim 1, wherein the thixotropic agent is calcium carbonate powder.
10. The non-drying sealer composition according to claim 2, wherein the shrinking component is trifunctional polypropylene glycol.
Description
CROSS-REFERENCE TO RELATED APPLICATION
This application claims priority from Japanese patent application No. 2000-293096, filed on Sep. 26, 2000, the complete disclosure of which is hereby incorporated into the patent application by this reference.
BACKGROUND OF THE INVENTION
The present invention relates to a novel non-drying sealer composition and a process for preparing the same. In particular, the present invention relates to a non-drying sealer composition which is suitable for sealing a gap between a sheet-metal flange and the inside of a trim part by charging the composition into the inside of the trim part of a weatherstrip for an automobile.