Method of formulating low gravity sponge rubber for automotive weatherstrips
a technology of automotive weatherstrips and sponge rubber, which is applied in the direction of vehicle sealing arrangements, mechanical equipment, transportation and packaging, etc., can solve the problems of general suffering of surface quality and stiffness, weight reduction, etc., and achieves the effects of reducing the weight of the sponge bulb member material, reducing the specific gravity of the blowing, and improving surface appearan
Inactive Publication Date: 2017-08-24
COOPER STANDARD AUTOMATIVE INC
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AI Technical Summary
Benefits of technology
The use of thermo-expandable microspheres achieves a significant reduction in weight with improved surface appearance and retained performance parameters, including stiffness and resistance to environmental factors, without sacrificing desirable properties.
Problems solved by technology
Weight reduction, however, must be balanced with the need to preserve properties such as surface quality and stiffness, which can suffer as the weight is reduced, and particularly as the blown specific gravity, which corresponds to weight, of sponge rubber compounds approaches or drops below about 0.60 g / cc.
However, properties such as surface quality and stiffness generally suffer once the blown specific gravity of the sponge bulb material compounds used in the weatherstrip formulations approach 0.60 g / cc or below.
Method used
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[0047]The following examples are provided to aid the reader in better understanding the invention disclosed herein, and are not intended to be limiting thereof, as varying parameters, constituents, and processing features differing from those exemplified, but in keeping with the full meaning of the teaching provided, will be apparent to those skilled in the art from a reading of the foregoing in conjunction with these examples.
[0048]In preparing the sponge rubber composition, a commercially available base rubber composition or sponge rubber composition may be used. Alternatively, a sponge rubber composition may be prepared as known in accordance with existing art. In either of the foregoing scenarios, the thermo-expandable microspheres and other additives may be added to the sponge rubber composition in accord with the following processing parameters. It is further understood that the additives may be mixed with the sponge rubber composition at the time of initial preparation of the...
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Abstract
The invention relates to automotive weatherstrip material. More specifically, the invention utilizes thermo-expand-able microspheres in the sponge bulb member of the weatherstrip to produce a microcellular structure which provides a lower weight weatherstrip material with improved surface appearance and comparable stiffness to known materials for use in the auto-motive industry, and exhibiting a blown specific gravity of less than about 0.60 g / cc.
Description
BACKGROUND OF THE DISCLOSURE[0001]The invention relates to automotive weatherstrip material. More specifically, the invention utilizes thermo-expandable microspheres to produce a microcellular structure that provides a lower weight weatherstrip material with improved surface appearance and comparable stiffness to known higher weight materials for use in the automotive industry.[0002]Automotive weatherstrip material is generally used to create a seal between adjoining surfaces of an automobile. The seal functions to prevent environmental factors, such air, dirt, and water, from passing into a sealed portion or area of a vehicle. For example, a weatherstrip may be used to create body seals, trunk lid seals, door-to-door seals, door-to-frame seals, rocker seals, and hood seals, among others.[0003]The automotive industry continually strives to reduce the weight of automobiles and other vehicles. This is due in part to the fact that weight affects fuel consumption which is regulated by g...
Claims
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IPC IPC(8): B60J10/16B60J10/36E06B7/23C08L21/00
CPCB60J10/16C08L21/00E06B7/2316E06B7/2314B60J10/36Y10T428/249986Y10T428/249987Y10T428/249991
Inventor GOPALAN, KRISHNAMACHARILENHART, ROBERT
Owner COOPER STANDARD AUTOMATIVE INC