Dow Corning Corporation

James McVie

Martin Rowlands

Stephen E Cray

Paul A Yianni

Daniel Graiver

John Donald Blizzard

Arnold W Lomas

Derek William Butler

Steven E Cray

Jenny L Gilles

A process of manufacturing elastomeric fibers in which fibers are obtained by co-extruding an extrudable and curable .tbd.SiO-- containing material and an aqueous organic polymer solution into a coagulation bath. The .tbd.SiO-- containing material is surrounded by the coagulated organic polymer. The .tbd.SiO-- containing material is then cured inside the protective sheath that is formed, and thereafter the organic polymer sheath is dissolved to expose a continuous elastomeric fiber of the .tbd.SiO-- material.

Method of making fibers

Novel neopentasiloxane compounds of the general formula Si[OSiR.sub.2 Q].sub.4 wherein R denotes a monovalent hydrocarbon or halohydrocarbon group and Q denotes a group R or a group comprising a block of at least two oxyalkylene units and having a terminal group containing a reactive hydrogen atom, not more than one Q denoting an R group. The invention also encompasses a film-forming composition comprising a curable polyurethane resin and the neopentasiloxane, and the use of the film-forming compositions to provide breathable (water vapour permeable) coatings on textile fabrics.

Organosilicon compounds and their use in film-forming compositions

Organosilicon compounds are disclosed which are multi-functional and possess utility as chain branching agents for aminofunctional polysiloxanes used in the softening of textiles and fabrics. The organosilicon compounds possess epoxy functionality and may have further alkyl functionality and/or polyalkylene oxide functionality.

Organosilicon compounds

The specification describes and claims certain organosilicon compounds and the preparation thereof. The organosilicon compounds comprise (A) a silane according to the general formula R.sup.1.sub.a A.sub.b Si(R'NXR').sub.c or (B) a polysiloxane comprising one or more siloxane units according to the general formula (i) ##EQU1## any remaining units of the polysiloxane being at least predominantly according to the general formula (ii) ##EQU2## A represents a hydroxyl or a hydrolyzable group, R.sup.1 represents a monovalent hydrocarbon group having up to 8 carbon atoms, R.sup.2 represents a hydroxyl group, a group R.sup.1, a group OR.sup.1 or a group COR.sup.1, R.sup.4 represents a hydrogen atom, an alkyl group having 1 to 20 carbon atoms, an alkenyl group or an aryl group, R' represents a group R.sup.4 or a group X, R' represents a divalent hydrocarbon group which may have nitrogen, oxygen or sulphur present in the carbon chain, X represents a group CO(CHR).sub.n OH in which R represents a hydrogen atom or an alkyl group, a has the value 0, 1, or 2, b has the value 1, 2, or 3, c has the value 1 or 2, the sum of a+b+c=4, m has the value 0, 1 or 2, p has the value 1 or 2, q has the value 0, 1, 2 or 3, r has the value 0, 1 or 2, and n has a value in the range 2 to 7. The organosilicon compounds are useful in compositions for treating fabrics.

The specification describes and claims a method of treating fibrous material which comprises applying to the fibrous material a composition comprising an organosilicon compound having a group .dbd.NCO(CH).sub.n OH connected with a silicon atom of the organosilicon compound. The organosilicon compound consists of or comprises (A) a silane according to the genral formula R.sup.1.sub.a A.sub.b Si(R'NXR').sub.c or (B) a polysiloxane comprising one or more siloxane units according to the general formula (i) ##EQU1## any remaining units of the polysiloxane being at least predominantly according to the general formula (ii) ##EQU2## A represents a hydroxyl or a hydrolysable group, R.sup.1 represents a monovalent hydrocarbon group having up to 8 carbon atoms, R.sup.2 represents a hydroxyl group, a group R.sup.1, a group OR.sup.1 or a group COR.sup.1, R.sup.4 represents a hydrogen atom, an alkyl group having 1 to 20 carbon atoms, an alkenyl group or an aryl group, R.sup.1 represents a group R.sup.4 or a group X, R' represents a divalent hydrocarbon group which may have nitrogen, oxygen or sulphur present in the carbon chain, X represents a group CO(CHR).sub.n OH in which R represents a hydrogen atom, a hydroxyl group, a hydrocarbon group or a hydroxyl substituted hydrocarbon group a has the value 0, 1 or 2, b has the value 1, 2 or 3, c has the value 1 or 2, the sum of a+b+c=4, m has the value 0, 1 or 2, p has the value 1 or 2, q has the value 0, 1, 2 or 3, r has the vale 0, 1 or 2 and n has a value in the range 2 to 7. Fabrics treated according to the method have a satisfactory handle and improved non-yellowing properties.

Treatment of fibrous materials

Siloxane-polyester compositions comprising (1) a siloxane-polyester copolymer resin (2) one or more solvents for the siloxane-polyester copolymer, (3) a silane wherein one of the groups attached to silicon is an epoxy-substituted organic group, at least two of the remaining valencies of the silicon atom being satisfied by alkoxy or alkoxyalkoxy groups, and (4) a titanium chelate. The presence of (3) and (4) improves the rate of cure of the siloxane-polyester, and the compositions are useful for providing decorative and/or protective coatings on metals, plastics and other substrates.

Siloxane-polyester compositions

Siloxane-polyester compositions comprising (A) a siloxane-polyester copolymer, (B) a solvent for the siloxane-polyester copolymer, (C) a silane wherein one of the groups attached to silicon contains at least one amino group and (D) a silane having 3 or 4 alkoxy or alkoxyalkoxy groups attached to silicon any remaining groups being hydrocarbon or hydrocarbon ether groups. The compositions may also contain a siloxane condensation catalyst and are useful for coating substrates such as metals and plastics.

Growing community of inventors

Barry, United Kingdom

James McVie