Patents by Inventor Stephen Westall
Stephen Westall has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 9284454Abstract: By preparing a one part silicone RTV composition with a high initial uncured plasticity, specifically a Williams plasticity of from 80 to 900 mm, formulations can be prepared that are easy and convenient for consumers to mold into a variety of shapes, which, once molded, will hold their shape exactly during cure without slump or flow.Type: GrantFiled: November 29, 2007Date of Patent: March 15, 2016Assignee: FormFormForm Ltd.Inventors: Jane Mary Delehanty, Ian Moss, Stephen Westall, Thomas Dowden
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Publication number: 20100144961Abstract: By preparing a one part silicone RTV composition with a high initial uncured plasticity, specifically a Williams plasticity of from 80 to 900 mm, formulations can be prepared that are easy and convenient for consumers to mould into a variety of shapes, which, once moulded, will hold their shape exactly during cure without slump or flow.Type: ApplicationFiled: November 29, 2007Publication date: June 10, 2010Applicant: Form Form Form Ltd.Inventors: Jane Mary Delehanty, Ian Moss, Stephen Westall, Thomas Dowden
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Patent number: 7238768Abstract: An amino-functional polysiloxane is prepared by reacting an aminosilane (A) which contains an aminoalkyl group and at least one alkoxy group bonded to Si with a carboxylic acid and a silanol-functional polysiloxane (B). The aminosilane (A) is partially converted into its carboxylate salt which acts as a catalyst for the siloxane condensation polymerization reaction between (A) and (B).Type: GrantFiled: November 21, 2006Date of Patent: July 3, 2007Assignee: Dow Corning CorporationInventors: Peter Cheshire Hupfield, Avril Surgenor, Stephen Westall
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Patent number: 7208619Abstract: A silane or siloxane containing at least one organic group is prepared by a hydrosilylation reaction between a silane or siloxane (A) containing at least one Si—H group and an allyl compound (B) in the presence of a noble metal catalyst. The silane or siloxane (A) and the allyl compound (B) are fed continuously through a reaction zone which is maintained at a temperature in the range 115–200° C. and which is provided with heat exchanger means to dissipate the heat from the exothermic hydrosilylation reaction. The residence time of (A) and (B) in the reaction zone is less than 20 minutes.Type: GrantFiled: July 18, 2002Date of Patent: April 24, 2007Assignee: Dow Corning LimitedInventors: Timothy Rex Bunce, Avril Surgenor, Stephen Westall
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Publication number: 20070073028Abstract: An amino-functional polysiloxane is prepared by reacting an aminosilane (A) which contains an aminoalkyl group and at least one alkoxy group bonded to Si with a carboxylic acid and a silanol-functional polysiloxane (B). The aminosilane (A) is partially converted into its carboxylate salt which acts as a catalyst for the siloxane condensation polymerization reaction between (A) and (B).Type: ApplicationFiled: November 21, 2006Publication date: March 29, 2007Inventors: Peter Hupfield, Avril Surgenor, Stephen Westall
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Publication number: 20040220420Abstract: A silane or siloxane containing at least one organic group is prepared by a hydrosilylation reaction between a silane or siloxane (A) containing at least one Si—H group and an allyl compound (B) in the presence of a noble metal catalyst. The silane or siloxane (A) and the allyl compound (B) are fed continuously through a reaction zone which is maintained at a temperature in the range 115-200° C. and which is provided with heat exchanger means to dissipate the heat from the exothermic hydrosilylation reaction. The residence time of (A) and (B) in the reaction zone is less than 20 minutes.Type: ApplicationFiled: January 20, 2004Publication date: November 4, 2004Inventors: Stephen Westall, Avril Surgenor, Timothy Bunce
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Publication number: 20040210074Abstract: An amino-functional polysiloxane is prepared by reacting an aminosilane (A) which contains an aminoalkyl group and at least one alkoxy group bonded to Si with a carboxylic acid and a silanol-functional polysiloxane (B). The aminosilane (A) is partially converted into its carboxylate salt which acts as a catalyst for the siloxane condensation polymerization reaction between (A) and (B).Type: ApplicationFiled: May 13, 2004Publication date: October 21, 2004Inventors: Peter Cheshire Hupfield, Avril Surgenor, Stephen Westall
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Patent number: 5344906Abstract: Process for the production of condensation products or organosilicon compounds having at least one silicon-bonded hydroxyl group. The process comprises contacting the organosilicon compound with a quaternary ammonium borate, -phosphate, -carbonate or -silicate. May be employed for example for the polymerisation of .alpha., w silanol-terminated polydiorganosiloxanes and for the production of organosiloxanes having organofunctional e.g. aminoalkyl groups.Type: GrantFiled: August 16, 1993Date of Patent: September 6, 1994Assignee: Dow Corning LimitedInventor: Stephen Westall
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Patent number: 5256755Abstract: Process for the production of organosiloxanes comprising contacting (A) at least one organosilicon compound having in the molecule at least one silanol group, the organic substituents being selected from monovalent hydrocarbon groups having from 1 to 14 carbon atoms and monovalent substituted hydrocarbon groups having from 1 to 10 carbon atoms, with (B) one or more compounds selected from rubidium carbonate, cesium carbonate and carboxylates of rubidium and cesium.Type: GrantFiled: August 3, 1992Date of Patent: October 26, 1993Assignee: Dow Corning LimitedInventor: Stephen Westall
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Patent number: 5210129Abstract: A method of making a dispersion of a high viscosity siloxane in a volatile, especially cyclic siloxane, comprises first dispersing organopolysiloxanes having at least 2 Si--OR groups, wherein R is H or alkyl in a volatile siloxane and adding a catalyst which is either a phosphonitrile halide having the general formula [X(PX.sub.2 .dbd.N).sub.n PX.sub.3 ].sup.+ [MX.sub.(v-t+1) R.sub.t ].sup.-, or a heterogeneous catalyst selected from Li, Mg, Ca, Sr or Ba hydroxide, Na or K borate or phosphate, Rb or Cs carbonate or carboxylates of Rb or Cs wherein M is an element having an electronegativity of from 1.0 to 2.0, R is alkyl, X is halide, n is 1 to 6, v is the valence of M and t is from 0 to (v-1).Type: GrantFiled: March 2, 1992Date of Patent: May 11, 1993Assignee: Dow Corning S.A.Inventors: Jean de la Croi Habimana, Stephen Westall
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Patent number: 5109093Abstract: A process for the preparation of an organosilicon condensation product which comprises reacting together at a temperature of at least 50.degree. C. (A) an organosilicon compound having in the molecule at least one silicon-bonded hydroxyl group; and (B) an organosilicon compound having in the molecule at least one silicon-bonded --OX group, in which X respresents an alkyl group having from 1 to 8 carbon atoms or an alkoxyalkyl group having from 2 to 8 carbon atoms, in the presence of a catalytic substance which is selected from strontium hydroxide and barium hydroxide.Type: GrantFiled: January 31, 1990Date of Patent: April 28, 1992Assignee: Dow Corning LimitedInventors: Sian B. Rees, Stephen Westall
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Patent number: 5109094Abstract: A process for the production of an organosilicon condensation product which comprises contacting (A) at least one organosilicon compound having in the molecule at least one silicon-bonded hydroxyl group, the organic substituents being selected from monovalent hydrocarbon groups having from 1 to 14 carbon atoms and monovalent substituted hydrocarbon groups having from 1 to 10 carbon atoms in which the substituents are selected from amino, halogen, mercapto, hydroxyl, amido and ester, with (B) a hydroxide selected from the group consisting of magnesium, calcium, strontium and barium hydroxides.Type: GrantFiled: January 31, 1990Date of Patent: April 28, 1992Assignee: Dow Corning LimitedInventors: Sian B. Rees, Stephen Westall
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Patent number: 5073618Abstract: Process for the production of organosilicon condensation products which comprises contacting (A) at least one organosilicon compound having in the molecule at least one silanol group, the organic substituents being selected from monovalent hydrocarbon groups having from 1 to 14 carbon atoms and monovalent substituted hydrocarbon groups having from 1 to 10 carbon atoms, and (B) a borate or phosphate of sodium or potassium.The condensation products find application in, for example textile treatments and paper coating.Type: GrantFiled: January 31, 1990Date of Patent: December 17, 1991Assignee: Dow Corning LimitedInventor: Stephen Westall
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Patent number: 4631208Abstract: Organosiloxane-oxyalkylene copolymers in which a silicon atom of at least one organosiloxane unit has attached thereto the group--X(OR).sub.n OSiR'.sub.a (OR").sub.3-awherein X represents a divalent hydrocarbon group, R represents an alkylene group having 2 to 4 carbon atoms, n is an integer of at least 2, R' represents alkyl, vinyl, allyl or phenyl, R" represents alkyl or alkoxyalkyl and a has a value of 1 or 2, at least 40% of the total substituents in the copolymer being methyl.The copolymers are film forming and are particularly suitable for the treatment of textile fibres to facilitate the removal of oily stains during laundering.Type: GrantFiled: October 28, 1985Date of Patent: December 23, 1986Assignee: Dow Corning, Ltd.Inventor: Stephen Westall
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Patent number: 4624676Abstract: Novel organosiloxanes containing units of the formula ##STR1## in which Q represents a divalent group composed of carbon and hydrogen, and optionally oxygen or sulphur, and R represents a monovalent hydrocarbon group, the organosiloxanes also containing at least two silicon-bonded substituents selected from hydrogen atoms, alkoxy groups and alkoxyalkoxy groups. The organosiloxanes can be applied to textile fibres, optionally in conjunction with crosslinking agents and catalysts, to impart thereto resistance to soiling by oily substances.Type: GrantFiled: December 27, 1985Date of Patent: November 25, 1986Assignee: Dow Corning, Ltd.Inventors: James W. White, Stephen Westall, Brian J. Griffiths
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Patent number: 4599438Abstract: Novel organosiloxanes containing units of the formula ##STR1## in which Q represents a divalent group composed of carbon and hydrogen, and optionally oxygen or sulphur, and R represents a monovalent hydrocarbon group, the organosiloxanes also containing at least two silicon-bonded substituents selected from hydrogen atoms, alkoxy groups and alkoxyalkoxy groups. The organosiloxanes can be applied to textile fibres, optionally in conjunction with crosslinking agents and catalysts, to impart thereto resistance to soiling by oily substances.Type: GrantFiled: October 31, 1983Date of Patent: July 8, 1986Assignee: Dow Corning, Ltd.Inventors: James W. White, Stephen Westall, Brian J. Griffiths
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Patent number: 4490416Abstract: Organosiloxane-oxyalkylene copolymers in which at least one silicon atom of an organosiloxane unit has attached thereto a group ##STR1## in which X is a divalent hydrocarbon group, R is an alkylene group, n is an integer of at least 2, Z is an organic substituent containing an epoxy group, R' is lower alkyl, vinyl or phenyl, R" is alkyl or alkoxyalkyl and a is 0 or 1, at least 40 percent of the total substituents in the copolymer being methyl.The copolymers are film forming and may be applied to continuous or porous substrates from aqueous or non-aqueous solutions.Type: GrantFiled: May 15, 1984Date of Patent: December 25, 1984Assignee: Dow Corning LimitedInventors: Stephen Westall, James W. White
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Patent number: 4448810Abstract: Process for the treatment of fibres e.g. of nylon or polyester/cotton in which the fibres are contacted with a polydiorganosiloxane having at least one --OM group, in which M represents H, alkyl or alkoxyalkyl, and at least one quaternary ammonium salt substituent --RN.sup.+ (R").sub.2 R'X.sup.- in which R represents a divalent hydrocarbon or hydrocarbonoxy group, R' represents a monovalent hydrocarbon group or an alkyleneoxy or polyalkyleneoxy group, each R" represents methyl or ethyl and X represents a halogen atom.The treatment facilitates the removal of oily stains during laundering and may be applied in conjunction with other silicones.Type: GrantFiled: October 15, 1982Date of Patent: May 15, 1984Assignee: Dow Corning LimitedInventor: Stephen Westall
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Patent number: 4421796Abstract: The removal of oily soil from textile fibres which have been treated with organosiloxanes, e.g. for improved handle or crease recovery, is facilitated if the fibres are also treated with an organosilane of the general formulaY.sub.3 SiRN.sup.+ (R").sub.2 R'X.sup.-in which Y is hydrocarbon, alkoxy or alkoxyalkoxy, at least one Y being alkoxy or alkoxyalkoxy, R represents a divalent hydrocarbon or hydrocarbonoxy group, R' represents a monovalent hydrocarbon group or an alkyleneoxy or polyalkyleneoxy group, each R" represents methyl or ethyl and X represents a halogen atom.Type: GrantFiled: September 24, 1982Date of Patent: December 20, 1983Assignee: Dow Corning LimitedInventors: Peter M. Burril, Stephen Westall
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Patent number: 4417066Abstract: Process for the preparation of organosiloxane polymers wherein there are reacted together (A) a silanol-terminated polydiorganosiloxane in which at least 50% of the organic substituents are methyl, and (B) a quaternary ammonium silaneRR'.sub.2 Si--Q--N.sup.+ X.sub.2 YZ.sup.31wherein R' represents an alkoxy or alkoxyalkoxy group, R represents alkyl, phenyl, vinyl or a group as defined for R', Q represents a divalent group, X represents alkyl, aryl, aralkyl or alkaryl, Y represents a monovalent hydrocarbon group or the group (--OM).sub.a OD, wherein M represents an alkylene group having 2 or 3 carbon atoms, a has a value of from 1 to 20 and D represents H, alkyl or acyl, and Z is a halogen atom.The organosiloxane polymers can be crosslinked and are useful for the treatment of textiles.Type: GrantFiled: September 22, 1982Date of Patent: November 22, 1983Assignee: Dow Corning LimitedInventor: Stephen Westall