Rhodia Chimie

Rhone-poulenc Chimie

Bluestar Silicones France Sas

André Lievre

Christian Mirou

Christophe Guyot

Didier Dhaler

Alain Pouchelon

Joel Richard

Jean-Paul Benayoun

Daniel Ariagno

Sean Duffy

Bernard Mirabel

Theresa Michael

Francois Desne

The invention relates to an aqueous silicone emulsion comprising polyorganosiloxanes (POS) with Si-vinyl units and POS with SiH units, cross-linkable by polyaddition in the presence of a platinum catalyst. The emulsion also contains an agent (e.g., buffer) for setting and maintaining pH between 5 and 9 in an amount sufficient to eliminate or significantly reduce foam or gel formation; an emulsifying agent; optionally a polyaddition inhibitor and other additives such as a filler, biocide, antifoam, anti-freeze, coloring agent, synthetic latex. The emulsions can comprise three different families of dispersed silicone phase droplets (e.g., polyorganosiloxane (A), polyorganosiloxane (B) and catalyst). Such emulsions can be used in the preparation of anti-adherent coating on fibrous or non fibrous supports. The invention also concerns a method for preparing said emulsions and methods for coating supports, for example paper, using said emulsion.

Aqueous silicone emulsion, process for preparing and use as a water-repellent and anti-adhesive paper coating base

The invention concerns a silicone/adhesive complex comprising at least a silicone coating applied on a first support and an adhesive coating applied on a second support, and whereof the release force of a silicone/adhesive interface is capable of being modulated. The invention is characterized in that its silicone coating results from heat polymerization and/or curing of: either monomers, oligomers and/or polymers bearing at least a reactive Si&#x2014;H structural unit and monomers, oligomers and/or polymers bearing at least a reactive unsaturated aliphatic group; or monomers, oligomers and/or polymers bearing at least a reactive Si&#x2014;OH structural unit; or monomers, oligomers and/or polymers bearing at least a reactive Si&#x2014;H structural unit and monomers oligomers and/or polymers bearing at least a reactive epoxy, oxetane and/or dioxolane unit; and said silicone coating further comprises at least an additive adjusting the release force of a silicone/adhesive interface and whereof the activity is photochemically initiated and adjustable.

Heat-curable silicone adhesive complex whereof the interface has release force capable of being modulated

The invention concerns a silicone/adhesive complex including at least one silicone coating applied on a first support and an adhesive coating applied on a second support, wherein the release force of a silicone/adhesive interface is capable of being modulated. The invention is characterized in that its silicone coating results from polymerization and/or curing by cationic process of polyorganosiloxane monomers, oligomers and/or polymers bearing as reactive groups at least epoxy, oxetane, dioxolane and/or alkenylether functions and the silicone coating further includes at least an additive regulating the release force of a silicone/adhesive interface and whereof the activity is photochemically initiated and adjustable.

Carbon-curable silicone/adhesive complex whereof the interface has release force capable of being modulated

Process for the continuous coating of a strip of paper or of a textile support using a silicone composition, comprising at least one POS A containing SiVi or SiOR groups, a POS B containing SiH groups and a catalyst C (for hydrosilylation or for dehydrogeno-condensation) and not corresponding to an LTC/FC silicone system, the said process comprising the following steps: step 1 in which conditions for homogeneously mixing the constituents A, B and C are used such that the homogeneity obtained is reflected by a DSC signature comprising a Gaussian peak for which the peak end temperature T3 is in the range from a value above 110&deg; C. to 200&deg; C., the said conditions making use of means for very precisely metering the constituents, means for premixing the constituents other than C and means for homogeneously mixing C with the premix(es) prepared; step 2 of conveying the homogeneous mixture to the coating site; step 3 of coating the support with the homogeneous mixture; and step 4 of crosslinking, in particular with thermal means.

Process and device for coating a support using a crosslinkable silicone composition

The present invention relates to crosslinkable or crosslinked silicone compositions capable of being employed especially for forming an abherent coating or film for a fibrous or other support, for example made of paper or the like, or made of natural or synthetic polymer (film). One of the essential objectives of the invention is to provide a crosslinkable or crosslinked silicone composition which provides a satisfactory solution to the abherence/printability dilemma, traditionally encountered in abherent silicone coatings. This objective and others are attained by the composition of the invention, including at least one polyorganosiloxane and at least one polyvinyl alcohol corresponding to the following specifications: ester value (E.V.) higher than or equal to 80, preferably 100 and still more preferably between 120 and 200, and standard dynamic viscosity (.eta..sub.dt) lower than 12 mPa s and preferably lower than 10 mPa s, the dry weight ratio of the polyorganosiloxane fraction to the PVA fraction being established between 0.5 and 10, preferably between 1 and 5 and still more preferably between 1.5 and 3.5.

Abherent and printable, crosslinkable or crosslinked silicone composition

The present invention relates to the use, as antiadhesive agents and/or water repellents, of grafted functionalized polyorganosiloxanes consisting of grafted copolymer moieties, derived from at least one ethylenically unsaturated monomer which may be polymerized via a radical route and from a functionalized polyorganosiloxane (I) containing similar or different moieties (I) of formula (I)

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Saint Genis Laval, France

André Lievre