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US 5,965,645 AGranted
Plastisol composition
AssigneeTeroson GmbH
InventorsMichael Beck, Wolfgang Ritter, Klaus Ruch
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AssigneeTeroson GmbH
InventorsMichael Beck, Wolfgang Ritter, Klaus Ruch
Estimating the term…
A plastisol composition containing plasticizers, fillers and styrene copolymers selected from (a) styrene, .alpha.-methyl styrene and p-methyl styrene, and (b) 3 to 20% by weight, based on the weight of the styrene copolymers, of a comonomer selected from methacrylic acid, acrylic acid and itaconic acid, and optionally (c) a crosslinking comonomer, wherein the maximum of the molecular weight distribution of said copolymers is greater than 1 million as determined by gel permeation chromatography.
A plastisol composition free of polyvinyl chloride comprising plasticizers, fillers and (a) copolymers of styrene selected from styrene, .alpha.-methyl styrene and p-methyl styrene, and (b) 3 to 20% by weight, based on the weight of said copolymers of styrene, of a comonomer selected from the group consisting of methacrylic acid, acrylic acid and itaconic acid, and (c) an initiator system for producing said copolymers of styrene selected from the group consisting of hydrogen peroxide and ascorbic acid, hydrogen peroxide and isoascorbic acid, sodium peroxodisulfate and ascorbic acid or isoascorbic acid, potassium peroxodisulfate and ascorbic acid or isoascorbic acid, ammonium peroxodisulfate and ascorbic acid or isoascorbic acid, hydrogen peroxide and sodium formaldehyde sulfoxylate, hydrogen peroxide and sodium bisulfate and mixtures thereof, wherein at least 50% by weight of the molecular weight distribution peak of said copolymers is greater than 1 million as determined by gel permeation chromatography.
The process of improving the properties of a plastisol applied to a substrate comprising applying to said substrate a plastisol composition free of polyvinyl chloride comprising plasticizers, fillers and (a) copolymers of styrene selected from styrene, .alpha.-methyl styrene and p-methyl styrene, and (b) 3 to 20% by weight based on the weight of said copolymers of styrene, of a comonomer selected from the group consisting of methacrylic acid, acrylic acid and itaconic acid, and (c) an initiator system for producing said copolymers of styrene selected from the group consisting of hydrogen peroxide and ascorbic acid, hydrogen peroxide and isoascorbic acid, sodium peroxodisulfate and ascorbic acid or isoascorbic acid, potassium peroxodisulfate and ascorbic acid or isoascorbic acid, ammonium peroxodisulfate and ascorbic acid or isoascorbic acid, hydrogen peroxide and sodium formaldehyde sulfoxylate, hydrogen peroxide and sodium bisulfate and mixtures thereof, wherein at least 50% by weight of the molecular weight distribution peak of said copolymers is greater than 1 million as determined by gel permeation chromatography.
Dependencies are inferred from the claim text.
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Processes: prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step
With organic compounds as principal constituents: polymers, e.g. resins
Polymers of compounds having carbon-to-carbon double bonds: polymers of olefins
Polymers of alpha-beta ethylenically unsaturated carboxylic acids or of derivatives thereof: polymers of alpha-beta ethylenically unsaturated…
Term ended 4 Dec 2016 (estimated)
USPTO file history isn’t available for this patent, so only indexed dates are shown.
1. Field of the Invention
This invention relates to a new plastisol composition based on styrene copolymers, plasticizers and inorganic fillers and, optionally, other standard additives.
Plastisols are generally understood to be dispersions of organic polymers in plasticizers which gel on heating to relatively high temperatures and harden on cooling. By far the majority of plastisols still commonly used in practice today contain finely powdered polyvinyl chloride (PVC) which is dispersed in a liquid plasticizer and forms a paste. Corresponding polyvinyl chloride plastisols are used for various applications. They are employed inter alia as sealing compounds, for example for seam sealing in metal containers or as flanged seam adhesives in the metal industry, as corrosion-inhibiting coatings for metals (for example as an underseal for motor vehicles), for impregnating and coating substrates of textile materials (for example as a coating for carpet backings), as cable insulations, etc.
The invention is illustrated by the following Examples.
Production of the Copolymer
The reaction takes place in reactor R1. The reactor is equipped with a stirrer consisting of three MIG stages. The rotational speed of the stirrer is infinitely variable. Tanks R2, R3 and R4 are used as receivers. The receivers are stirred.