Rhone-poulenc Chimie

Rhodia Chimie

Rhone-poulenc, Inc.

Gilles Mur

Michel M Gay

Dominique Dupuis

Dominique Labarre

Serge Chassaing

Thierry Chopin

Sylvie Lavault

Louis Carette

Francedillaoise Henrio

Michel Allas

Composite particles including an organic polymer and an oxide and/or

Composite core/sheath particulates comprising an organic polymer core at least partly coated with calcium carbonate, these core/sheath particulates having a mean particle size not exceeding 5 .mu.m, well suited for reinforcing plastic/elastomer substrates, are conveniently converted, e.g., via calcination, into hollow calcium carbonate microbeads which comprise CaCO.sub.3 shells having a mean particle size not exceeding 5 .mu.m; such hollow microbeads are themselves well suited for enhancing the low-temperature flexibility of elastomer substrates, notably vehicle tires.

Polymer/CaCO.sub.3 composite core/sheath particulates and hollow         .

The present invention is directed to compositions containing novel beta-diketones of formula (I) and formula (II),

.beta.-diketones, processes for making .beta.-diketones and use of

Polymer/CaCO.sub.3 composite core/sheath particulates and hollow CaCO.sub.3

The invention relates to compositions for chlorine-containing polymer such as PVC, including a stabilizing composition. According to the invention the stabilizing composition includes: a) the unpurified crude product resulting from the reaction of condensation of an ester with a ketone in the presence of an alkaline agent, this crude product including between 10 and 95%, preferably between 20 and 80% by weight of beta-diketone, and b) a metal acetylacetonate complex, the ratio of the constituents a/b being between 50/50 and 1/99. The invention also relates to the standard objects obtained from these compositions.

Composition for chlorine-containing polymer based on beta-diketone and

The present invention relates to a stabilizing composition for a chlorine-containing polymer (PVC), characterized in that it comprises the unpurified crude product resulting from the reaction of an ester with a ketone in the presence of an alkaline agent, this crude product comprising at least 10 % by weight of .beta.-diketone and being in the form of a powder.

Stabilizing composition for chlorine-containing polymer comprising

Novel dihydropyridine compounds bearing substituted piperidyl substituents are effective heat/light stabilizers for a wide variety of polymer substrates, e.g., for halopolymers such as PVC, and are also effective anti-UV agents and antioxidants for such polymers as polyolefins, polystyrenes, polyalkadienes, polyurethanes, polyamides, polyesters, polycarbonates, polysulfones, polyethersulfones, polyetherketones, acrylic polymers, or copolymers or mixtures thereof.

Hindered amine-substituted dihydropyridines and heat/light stabilization

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Saint Maur des Fosses, France

Gilles Mur