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US 7,611,998 B2Granted
Enhanced elastomer coated, protective barrier fabric and process for producing same
AssigneeBluestar Silicones France SAS
InventorsScott Richard Jackson, Pierre Defaux
Life of this patent
Estimating the term…
Abstract
Coated barrier fabrics are prepared with a two part, cold cure polyoxysiloxane composition and a unique two pass, two cure rate, coating process. Preferably, the coated fabrics have overlayed a second uncoated fabric on the inner surface of the coated substrate. This preferred process realizes a reusable medical barrier fabric with exceptional durability even after undergoing many laundering/autoclaving/drying cycles.
Claims23
A process for producing a barrier fabric comprising the steps of
- preparing a coating composition consisting essentially of
- (1) at least one polyorganosiloxane oil having, per molecule, at least two C2-C6 alkenyl groups linked to the silicon,
- (2) at least one polyhydrogenoorganosiloxane oil having, per molecule, at least two hydrogen atoms linked to the silicon,
- (3) a catalytically effective amount of at least one catalyst, comprised of at least one metal belonging to the platinum group,
- (4) an adhesion promoter consisting essentially of:
- (4.1) 3-trimethoxysilylpropylmethacrylate silane (MEMO),
- (4.2) at least one organosilicon compound which includes at least one epoxy radical, and
- (4.3) from 0.38 to 2.0% by weight based on the total weight of the coating composition of at least one metal M chelate and/or one metal alkoxide of the general formula:
- M(OJ)n, with n equal to the valency of M and J equal to a linear or branched C1-C8 alkyl, M being selected from the group consisting of:
- Ti, Zr, Ge, Li, Mn, Fe, Al and Mg,
- (5) at least one polyorganosiloxane resin having at least two different functional units selected from the group consisting of R3SiO0.5 (M functional unit), R2SiO (D functional unit), RSiO1.5 (T functional unit), and SiO2 (Q functional unit) wherein at least one of the functional units is a T or Q functional unit, in which the R radicals are the same or different and are linear or branched C1-C6 alkyl, C2-C4 alkenyl, phenyl or 3,3,3-trifluoropropyl radicals, said resin having an alkenyl group weight content of between 0.1 and 20% by weight, and
- (6) at least one cross-linking inhibitor;
- applying a first coat on one side of a woven textile fabric with from 10 to 45 g/m2 of the coating composition;
- curing, at least partially, the first coat;
- applying a second coat onto the at least partially cured first coat with from 20 to 105 g/m2 of the coating composition, the exposed surface of the second coat now considered the inner surface of the fabric and the uncoated surface of the fabric now considered the outer surface;
- and
- curing the second coat, with the proviso that the rate of curing of said first coat is lower than that of the rate of curing of the second coat.
14 more elements
A process for producing barrier fabric comprising the steps of
- preparing a coating composition consisting essentially of
- (1) at least one polyorganosiloxane oil having, per molecule, at least two C2-C6 alkenyl groups linked to the silicon comprised of:
- (i) siloxyl functional units of formula:
- TaZbSiO[4−(a+b)]/2 (1.1)
- wherein:
- T is an alkenyl group, preferably vinyl or allyl,
- Z is a monovalent hydrocarbon group, free of any action unfavorable to the activity of the catalyst,
- a is 1 or 2,
- b is 0, 1 or 2, and
- a+b is between 1 and 3, and
- (ii) optionally other siloxyl functional units of formula:
- ZcSiO[4−c]/2 (1.2)
- wherein
- Z has the same meaning as above, and
- c has a value of between 0 and 3
- (2) at least one polyhydrogenoorganosiloxane oil having, per molecule, at least two hydrogen atoms linked to the silicon comprised of:
- (i) siloxyl functional units of formula:
- HdLeSiO[4−(d+e)]/2 (2.1)
- wherein:
- L is a monovalent, hydrocarbon group, free of any action unfavorable to the activity of the catalyst,
- d is 1 or 2,
- e is 0, 1 or 2, and
- d+e has a value of between 1 and 3, and
- (ii) optionally other siloxyl functional units of average formula:
- LgSiO[4−g]/2 (2.2)
- wherein
- L has the same meaning as above, and
- g has a value of between 0 and 3.
- (3) a catalytically effective amount of at least one catalyst comprised of at least one metal belonging to the platinum group,
- (4) an adhesion promoter consisting essentially of:
- 3-trimethoxysilylpropylmethacrylate silane (MEMO),
- at least one organosilicon compound comprised of:
- (i) siloxyl functional units of formula:
- HdLeSiO[4−(d+e)]/2 (2.1)
- wherein:
- L is a monovalent, hydrocarbon group, free of any action unfavorable to the activity of the catalyst,
- d is 1 or 2,
- e is 0, 1 or 2, and
- d+e has a value of between 1 and 3, and
- (ii) optionally other siloxyl functional units of average formula:
- LgSiO[4−g]/2 (2.2)
- wherein
- L has the same meaning as above, and
- g has a value of between 0 and 3, and
- from 0.38 to 2.0% by weight based on the total weight of the coating composition of alkoxy titanium,
- (5) at least one polyorganosiloxane resin having at least two different functional units selected from the group consisting of R3SiO0.5 (M functional unit), R2SiO (D functional unit), RSiO1.5 (T functional unit), and SiO2 (Q functional unit) wherein at least one of the functional units is a T or Q functional unit, in which the R radicals are the same or different and are linear or branched C1-C6 alkyl, C2-C4 alkenyl, phenyl or 3,3,3-trifluoropropyl radicals, said resin having an alkenyl group weight content of between 0.1 and 20% by weight, and
- (6) at least one cross-linking inhibitor selected from the group consisting of:
- polyorganosiloxanes substituted with at least one alkenyl group which may optionally be in cyclic form,
- pyridine,
- organic phosphines and phosphites,
- unsaturated amides,
- alkyl maleates, and
- alkynyl alcohols.
- applying a first coat on one side of a woven textile fabric with from 10 to 45 g/m2 of the coating composition;
- curing, at least partially, the first coat;
- applying a second coat onto the at least partially cured first coat with from 20 to 105 g/m2 of the coating composition, the exposed surface of the second coat now considered the inner surface of the fabric and the uncoated surface of the fabric now considered the outer surface;
- and
- curing the second coat, with the proviso that the rate of curing of said first coat is lower than that of the rate of curing of the second coat.
55 more elements
A process for producing barrier fabric comprising the steps of
- preparing a coating composition consisting essentially of
- (1) a mixture of 40 weight % MDViQ resin and 60 weight % vinyl terminated polydimethylsiloxane oil having a viscosity of 60,000 cps and an average mean molecular weight of 90,000,
- (2) a polyhydrogenoorganosiloxane oil crosslinker containing hydrogen atoms linked to a silicon atom at the ends of the chain and on the chain at regular intervals having a viscosity of 25 cps and an average mean molecular weight of 2,500 and 0.7% by weight of hydrogen atom,
- (3) a catalytically effective amount of chloroplatinic acid,
- (4) an adhesion promoter consisting essentially of:
- 3-trimethoxysilylpropylmethacrylate silane (MEMO),
- 3-glycidoxypropyltrimethoxysilane (GLYMO), and
- from 0.38 to 2.0% by weight based on the total weight of the coating composition of butyl titanate,
- (5) a vinyl terminated polydimethylsiloxane oil having a viscosity of 100,000 cps with an average mean molecular weight of 110,000 g/mol, and
- (6) 1-ethynyl-1-cyclohexanol;
- applying a first coat on one side of a woven textile fabric with from 10-45 g/m2 of the coating composition;
- curing, at least partially, the first coat;
- applying a second coat onto the at least partially cured first coat with from 20-105 g/m2 of the coating composition, the exposed surface of the second coat now considered the inner surface of the fabric and the uncoated surface of the fabric now considered the outer surface;
- and
- curing the second coat, with the proviso that the rate of curing of said first coat is lower than that of the rate of curing of the second coat.
12 more elements
A barrier fabric produced by a process comprising the steps of:
- preparing a coating composition consisting essentially of
- (1) at least one polyorganosiloxane oil having, per molecule, at least two C2-C6 alkenyl groups linked to the silicon,
- (2) at least one polyhydrogenoorganosiloxane oil having, per molecule, at least two hydrogen atoms linked to the silicon,
- (3) a catalytically effective amount of at least one catalyst, comprised of at least one metal belonging to the platinum group,
- (4) an adhesion promoter consisting essentially of:
- (4.1) 3-trimethoxysilylpropylmethacrylate silane (MEMO),
- (4.2) at least one organosilicon compound which includes at least one epoxy radical, and
- (4.3) from 0.38 to 2.0% by weight based on the total weight of the coating composition of at least one metal M chelate and/or one metal alkoxide of the general formula:
- M(OJ)n, with n equal to the valency of M and J equal to a linear or branched C1-C8 alkyl, M being selected from the group consisting of:
- Ti, Zr, Ge, Li, Mn, Fe, Al and Mg,
- (5) at least one polyorganosiloxane resin having at least two different functional units selected from the group consisting of R3SiO0.5 (M functional unit), R2SiO (D functional unit), RSiO1.5 (T functional unit), and SiO2 (Q functional unit) wherein at least one of the functional units is a T or Q functional unit, in which the R radicals are the same or different and are linear or branched C1-C6 alkyl, C2-C4 alkenyl, phenyl or 3,3,3-trifluoropropyl radicals, said resin having an alkenyl group weight content of between 0.1 and 20% by weight, and
- (6) at least one cross-linking inhibitor;
- applying a first coat on one side of a woven textile fabric with from 30 to 45 g/m2 of the coating composition;
- curing, at least partially, the first coat;
- applying a second coat onto the at least partially cured first coat with from 90 to 105 g/m2 of the coating composition, the exposed surface of the second coat now considered the inner surface of the fabric and the uncoated surface of the fabric now considered the outer surface;
- and
- curing the second coat, with the proviso that the rate of curing of said first coat is lower than that of the rate of curing of the second coat.
14 more elements
A barrier fabric produced by a process comprising the steps of
- preparing a coating composition consisting essentially of
- (1) a mixture of 40 weight % MDViQ resin and 60 weight % vinyl terminated polydimethylsiloxane oil having a viscosity of 60,000 cps and an average mean molecular weight of 90,000,
- (2) a polyhydrogenoorganosiloxane oil crosslinker containing hydrogen atoms linked to a silicon atom at the ends of the chain and on the chain at regular intervals having a viscosity of 25 cps and an average mean molecular weight of 2,500 and 0.7% by weight of hydrogen atom,
- (3) a catalytically effective amount of chloroplatinic acid,
- (4) an adhesion promoter consisting essentially of:
- 3-trimethoxysilylpropylmethacrylate silane (MEMO),
- 3-glycidoxypropyltrimethoxysilane (GLYMO), and
- from 0.38 to 2.0% by weight based on the total weight of the coating composition of butyl titanate,
- (5) a vinyl terminated polydimethylsiloxane oil having a viscosity of 100,000 cps with an average mean molecular weight of 110,000 g/mol, and
- (6) 1-ethynyl-1-cyclohexanol;
- applying a first coat on one side of a woven textile fabric with from 10-45 g/m2 of the coating composition;
- curing, at least partially, the first coat;
- applying a second coat onto the at least partially cured first coat with from 20-105 g/m2 of the coating composition, the exposed surface of the second coat now considered the inner surface of the fabric and the uncoated surface of the fabric now considered the outer surface;
- and
- curing the second coat, with the proviso that the rate of curing of said first coat is lower than that of the rate of curing of the second coat.
12 more elements
Dependencies are inferred from the claim text.