US 4,380,597 A · Thermoplastic compositions based on vinyl chloride polymers stabilized with polyhydroxyl compounds

Abstract

A stabilized thermoplastic composition comprised of polyvinyl chloride or mixed polymers containing mainly vinyl chloride units together with stabilizers and other conventional additives employed in thermoplastic compositions, which have as major stabilizer component, a content of 0.02 to 5 parts by weight of aliphatic polyhydroxyl compounds containing 4 to 6 OH-groups per 100 parts by weight of polymer. These polyhydroxyl compounds should contain at least one carboxyl and/or carbonyl group and/or double bond. Suitable compounds are gluconic acid, glucuronic acid, ketogluconic acid, ascorbic acid or the alkali metal salts or alkaline earth salts of the mentioned acids. Other conventional processing additives may be present. The invention concerns also a process for the manufacture of pipes, profiles, foils, hollow parts by hot forming, with the use of the mentioned additives, and the additional use of paraffin, free fatty acid, epoxidized soybean oil or higher molecular weight ester wax.

Claims26

Dependent claims

A stabilized thermoplastic composition comprised of polyvinyl chloride or mixed polymers containing mainly vinyl chloride units and a stabilizer additive composition of:

(1) heat stabilizers selected from the group consisting of metallic soaps, metallic phenolates and naphthenates and organotin compounds, and
(2) other conventional additives employed in thermoplastic compositions,
wherein said heat stabilizers include from 0.02 to 5 parts by weight, per 100 parts by weight of polymer, of at least one aliphatic compound selected from the group consisting of gluconic acid, glucuronic acid, ketogluconic acid, ascorbic acid, alkali metal salts of said acids, alkaline earth metal salts of said acids, and mixtures thereof.

A stabilized thermoplastic composition comprised of polyvinyl chloride or mixed polymers containing mainly vinyl chloride units and a stabilizer additive composition of:

(1) heat stabilizers selected from the group consisting of metallic phenolates and naphthenates, and organotin compounds, and
(2) other conventional additives employed in thermoplastic compositions,
wherein said heat stabilizers include:
(a) from 0.2 to 5 parts by weight, per 100 parts by weight of polymer, of at least one aliphatic compound selected from the group consisting of gluconic acid, glucuronic acid, ketogluconic acid, ascorbic acid, alkali metal salts of said acids, alkaline earth metal salts of said acids and mixtures thereof,
(b) from 0.05 to 5 parts by weight, per 1 part by weight, of said aliphatic compound, of at least one calcium salt of fatty acids with from 8 to 22 carbon atoms, and
(c) from 0.2 to 2 parts by weight, per 1 part by weight of said aliphatic compound, of at least one zinc salt of fatty acids with from 8 to 22 carbon atoms.

3 more elements

Dependencies are inferred from the claim text.

Thermoplastic compositions based on vinyl chloride polymers stabilized with polyhydroxyl compounds

Life of this patent

Thermoplastic compositions based on vinyl chloride polymers stabilized with polyhydroxyl compounds

Life of this patent

Abstract

Claims26