Abstract: Ternary alloys of PVC/CPVC/alloying polymers are disclosed which make use of the unexpected results of interactions between alloying polymers and CPVC and PVC, interactions which result in higher heat distortion temperatures than predictable by linear addition of the properties of the binary blends of PVC/CPVC and PVC/alloying polymer systems. This effect allows replacement of substantial amounts of alloying polymer with a predetermined amount of CPVC without changing substantially HDT or melt viscosity. Such effects allow the use of these ternary alloys in place of binary PVC/alloying polymer systems in injection molding and extrusion applications.

Abstract: The melt viscosity of chlorinated polyvinyl chloride is reduced by blending it with small amounts of low molecular weight polystyrene type polymers. Such blends also exhibit good mechanical compatibility.

Abstract: A method for making a conductive polymer for static charge dissipation, electromagnetic induction shielding, electroplating, or making a semiconductor comprises uniformly mixing into any number of polymer or polymer blends which are in a molten or semimolten state about 1 to about 30% by weight of sulfur to form a polymer/sulfur blend. Once the polymer/sulfur blend is solidified, by cooling, it is exposed to an aqueous cuprous ion solution whereby the cuprous ions react with the sulfur in the polymer/sulfur blend to form copper sulfide dendrites within the polymer. The aqueous cuprous ion solution may also contain elemental sulfur to aid in the formation of the copper sulfide. Additionally, the aqueous cuprous ion solution may also contain an effective amount of dilute hydrochloric acid or dilute ammonium hydroxide to aid in the facilitation of complexation. The conductive polymers of the present invention have a resistivity of less than about 10,000 ohms/sq. and preferably less than about 400 ohms/sq.

Abstract: A composition of matter comprising a blend of CPVC having a chlorine content of between about 60% and 66% by weight and a polymethylmethacrylate content of between about 0% and 80% by weight of the blend. The composition of matter displays substantially single, homogeneous phase behavior with the CPVC and polymethylmethacrylate being substantially or completely miscible. Blending of CPVC and polymethylmethacrylate provides a reulting blended polymeric material having enhanced temperature and durability properties. Melt processability of CPVC polymeric material may be enhanced by the inclusion of polymethylmethacrylate to form the blends.

Abstract: The cohesion, creep resistance and yield strength of pigmented chlorinated polyvinyl chloride resin, polyvinyl chloride resin, or blends thereof is improved by coating the pigment with an amino silane coupling agent prior to blending the resin and the pigment.

Abstract: Chlorinated polyvinyl chloride when blended with sulfur is often miscible and has reduced melt flow viscosity. Various metal carbonates impart improved stability and optionally various fibers can be utilized to increase the tensile strength of the composition.

Abstract: The invention provides an improved heat stabilization of post-chlorinated vinyl chloride polymers utilizing barium carbonate or cadmium carbonate that has a surface area greater than 2M.sup.2 /g.

Abstract: A composition of matter comprising a blend of CPVC having a chlorine content of between about 60% and 65% by weight and styrene-acrylonitrile copolymer having an acrylonitrile content of between about 15% and 25% by weight. The composition of matter displays substantially single, homogeneous phase behavior with the CPVC and styrene-acrylonitrile copolymer being substantially or completely miscible. Blending of CPVC and styrene-acrylonitrile copolymer provides a resulting blended polymeric material having enhanced temperature and durability properties. Melt processability of CPVC polymeric material may be enhanced by the inclusion of styrene-acrylonitrile copolymer to form the blends.

Abstract: A composition of matter comprising a blend of CPVC having a chlorine content of between about 60% and 66% by weight and a polymethylmethacrylate content of between about 0% and 80% by weight of the blend. The composition of matter displays substantially single, homogeneous phase behavior with the CPVC and polymethylmethacrylate being substantially or completely miscible. Blending of CPVC and polymethylmethacrylate provides a resulting blended polymeric material having enhanced temperature and durability properties. Melt processability of CPVC polymeric material may be enhanced by the inclusion of polymethylmethacrylate to form the blends.

Abstract: Chlorinated polyvinyl chloride resin (CPVC) is blended with a block copolymer of styrene and a diene (SD) or of styrene-diene-styrene (SDS), which block copolymer is referred to as a "pro-modifier" because, by itself, it performs a dual function of processing aid and impact modifier in CPVC. For tailoring specific desirable impact properties and physical characteristics into a CPVC resin composition, it may be desirable to use a conventional impact modifier in combination with the block copolymer. When the block copolymer is so used, such use being referred to as that of a "co-modifier", the block copolymer and conventional impact modifier provide a CPVC composition with unexpectedly enhanced impact strength. The block copolymer consists essentially of a vinyl aromatic compound and a conjugated idene, such as styrene-diene (SD) diblock copolymer, or a styrene-diene-styrene (SDS) polyblock copolymer having a linear or radial block structure, or mixtures of linear and radial block copolymers.

Abstract: Polyvinyl chloride (PVC) resin is compounded with a conventional impact modifier referred to herein as a "co-modifier", and a block copolymer "ultra-modifier" which together provide a composition of unexpectedly enhanced impact strength. Irrespective of the characteristic particle size distribution of the co-modifier, which may be normal, bimodal or neither, the combination of ultra-modifier and co-modifier produces a broad distribution of small and large modifier particles. Better impact strength than with either small particles alone, or large particles alone is thus obtained.