Rhone-Poulenc Industries

Rhone-Poulenc S.a.

Michel Bargain

Marcel Lefort

Zeno Pasquini

Christian Prud'Homme

Claude Millet

Robert Lagarde

Maurice Ducloux

The invention provides organosilicon compounds of the formula: ##STR1## in which: n is 1, 2 or 3;

Ethylenic silicon compounds and thermoplastic elastomers obtained

Novel organosilicon compounds and processes for their preparation are disclosed. The compounds are di- and trisilanes of the formula:

Polyethylene silicon compounds

Thermoplastic, crystalline block copolymers are disclosed, each comprising a plurality of recurring units selected from the group consisting of those of the structural formulae F.sub.1 and F'.sub.1, and combinations thereof:

Elastomeric organopolysiloxane block copolymers and non-elastomeric

Novel organosilicon compounds and processes for their preparation are disclosed. The compounds are di- and trisilanes of the formula

Novel organosilicon compounds containing various functional groups and processes for their preparation are disclosed. The compounds are silanes represented by the following general formula: ##STR1## wherein R represents a hydrocarbon radical containing a carbon-carbon double bond; R.sub.1 represents a hydrocarbon radical; G represents a divalent carbocyclic aromatic or heterocyclic radical; Y represents a group such as Cl, COCl, or COOH; and, n represents an integer equal to 1 or 2.

Organosilicon compounds with functional groups

The invention provides organosilicon compounds of the formula: ##STR1## in which: N IS 1, 2 OR 3;

Novel polysiloxane thermoplastic elastomers and processes for their preparation are disclosed. The elastomers are obtained by reaction of .alpha.,.omega.-dihydrogenpolysiloxane with a diethylene silicon compound.

Polysiloxane thermoplastic elastomers

Organopolysiloxanes are polymerized in the presence of an alkaline catalyst and a complex oxygen, sulfur or nitrogen heterocyclic compound.

Polymerization of organopolysiloxanes

An organopolysiloxane composition is disclosed which is transformable into elastomers by heating without using any vulcanizing agent. These compositions comprise:

Organopolysiloxane compositions transformable into elastomers without

A heat resistant heat-curable polymer composition obtained by reacting, between 50.degree. C. and 350.degree. C., (a) an oligomer having the average general formula: ##STR1## in which x represents a number from 0.1 to about 2, R represents a divalent hydrocarbon radical with 1 to 8 carbon atoms, which is derived from an aldehyde or a ketone of the general formula:

Heat-resistant polymers based on polyamines and oligomers possessing

New heat-stable resins are provided having good mechanical and electrical properties combined with chemical inertness at temperatures of 200.degree. to 300.degree. C, which resins are resins of a three-dimensional polyimide which is obtained by reacting, at between 50.degree. C and 350.degree. C, a bisimide of the general formula: ##STR1## in which Y denotes H, CH.sub.3 or Cl, and A represents a divalent organic radical possessing at least two carbon atoms, a polyamine of the general formula:

Heat-stable polyimide resins

New heat-stable resins are provided having good mechanical and electrical properties combined with chemical inertness at temperatures of 200.degree. to 300.degree. C, which resins comprise three-dimensional recurring units of the general formula: ##STR1## in which, in any particular recurring unit: A IS ZERO OR AN INTEGER FROM 1 TO 5; ##STR2## denotes a radical of the general formula ##STR3## p1 in which Y represents H, CH.sub.3 or Cl; G denotes a monovalent aromatic radical; and

Linear homopolymers of 3,5,5-trimethyl-5-sila-.delta.-valerolactone are crosslinked through the 5-methyl group, e.g. by heating with an organic peroxide, to give polymers. Films of these crosslinked polymers have a critical surface tension similar to Teflon and can be used for water proofing. The films also exhibit selective permeability to gases and can be used to reduce the CO.sub.2 content of CO.sub.2 /O.sub.2 mixtures.

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Lyon, France

Michel Bargain