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AssigneeOccidental Chemical Corporation
InventorsMichael T. Moran, Thomas E. Moses, Sherry Rohn Clancy
Estimating the term…
Polyvinyl chloride resin compositions and methods of preparation and use thereof for increasing the degree of whiteness in finished polyvinyl chloride foam. The resin compositions contain sulfur compounds selected from sulfonic acid derivatives, sulfinic acid derivatives, and mercapto acetic acid sodium salt, and optionally contain water soluble salts and/or t-butyl hydroperoxide.
A dry, particulate polyvinyl chloride dispersion resin for use in the production of whitened polyvinyl chloride foam comprising vinyl chloride polymer and
A dry, particulate polyvinyl chloride blending resin for use in a plastisol containing dry, particulate polyvinyl chloride dispersion resin for the production of whitened polyvinyl chloride foam, said dry, particulate polyvinyl chloride blending resin comprising vinyl chloride polymer and
A plastisol for use in the production of whitened polyvinyl chloride foam comprising a dry, particulate polyvinyl chloride dispersion resin and
A whitened polyvinyl chloride foam produced by heating a plastisol comprising a dry, particulate polyvinyl chloride dispersion resin and
A dry, particulate polyvinyl chloride dispersion resin for use in the production of whitened polyvinyl chloride foam comprising vinyl chloride polymer and
A dry, particulate polyvinyl chloride dispersion resin for use in the production of whitened polyvinyl chloride foam comprising vinyl chloride polymer and
A dry, particulate polyvinyl chloride blending resin for use in a plastisol containing dry, particulate polyvinyl chloride dispersion resin for the production of whitened polyvinyl chloride foam, said dry, particulate polyvinyl chloride blending resin comprising vinyl chloride polymer and
A dry, particulate polyvinyl chloride blending resin for use in a plastisol containing dry, particulate polyvinyl chloride dispersion resin for the production of whitened polyvinyl chloride foam, said dry, particulate polyvinyl chloride blending resin comprising vinyl chloride polymer and
A plastisol for use in the production of whitened polyvinyl chloride foam comprising a dry, particulate polyvinyl chloride dispersion resin and
A plastisol for use in the production of whitened polyvinyl chloride foam comprising a dry, particulate polyvinyl chloride dispersion resin and
A whitened polyvinyl chloride foam produced by heating a plastisol comprising a dry, particulate polyvinyl chloride dispersion resin and
A whitened polyvinyl chloride foam produced by heating a plastisol comprising a dry, particulate polyvinyl chloride dispersion resin and
Dependencies are inferred from the claim text.
From the US filing history. Foreign family members aren’t listed.
Use of organic additives: containing sulfur
Containing chlorine atoms: homopolymers or copolymers of vinyl chloride
Containing chlorine atoms: homopolymers or copolymers of vinyl chloride
Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers: polyurethanes
Term ended 6 Sep 2021 (estimated)
This invention relates to polyvinyl chloride (PVC) dispersion and blending resin compositions and to preparation and use of such compositions in the production of whitened PVC foam.
Polyvinyl chloride (PVC) foam processes often require a high degree of whiteness in the finished foam product without sacrificing process performance properties such as activation levels, cell structure, overblow protection and the like. The PVC resin used in the process is one of the ingredients primarily responsible for these performance characteristics. Previously, it has been attempted to control the desired characteristics by the use of additives, such as blowing agents, activators, pigments such as titanium dioxide and the like.
It is clearly desirable to achieve the improved whiteness without the use of or with the use of reduced quantities of these added materials.
According to the present invention, improved foam characteristics of a PVC foam can be achieved by adding at least one sulfur compound selected from sulfonic acid derivatives, sulfinic acid derivatives, and mercapto acetic acid sodium salt, and optionally adding at least one of a water soluble metal salt and t-butyl hydroperoxide, directly or indirectly, to at least one of a PVC dispersion resin polymerization recipe or latex, or to a PVC blending resin polymerization recipe or slurry, or to a PVC plastisol containing a PVC dispersion resin and optionally containing a PVC blending resin and heating the plastisol to produce a whitened foam. The term “dispersion resin” is used to describe any PVC resin that is made by an emulsion, microsuspension or HYBRID process primarily for use in the production of PVC plastisols. HYBRID is a registered trademark of Occidental Chemical Corporation for its PVC dispersion resin polymerization process. Typically the plastisol is heated to a temperature from about 180 to about 210° C. for a time from about 0.75 to about 1.75 minutes.
Typically the plastisol contains from about 15 to about 75 weight percent of the PVC dispersion resin based upon the total weight of the plastisol constituents. The PVC dispersion resin comprises PVC resin particles having an average particle diameter from about 0.1 to about 10 microns. The plastisol may also contain PVC blending resin. Typically the PVC blending resin comprises PVC resin particles having an average particle diameter from about 20 to about 40 microns and is present in the plastisol in an amount up to about 50 weight percent of the dry PVC resin in the plastisol.
According to the present invention, the sulfur compounds are used alone or in combination with water soluble metal salts and/or t-butyl hydroperoxide. The sulfur compounds are selected from the group consisting of sulfonic acid derivatives, sulfinic acid derivatives, and mercapto acetic acid sodium salt. The sulfonic acid derivatives generally have the formula R—SO3M wherein R is an alkyl, alkylaryl or arylalkyl group containing from 1 to 12 carbon atoms which may also contain one or more other functional groups such as hydroxyl, carboxyl, or the like and wherein M is selected from hydrogen and monovalent metals. Preferably M is selected from hydrogen, sodium and potassium.
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