Coated airbag, coating material and coating process

Details Coated airbag, coating material and coating process Coated airbag, coating material and coating process

1999-11-23

2002-12-10

Dawson, Robert (Department: 1712)

Coating processes

With post-treatment of coating or coating material

Heating or drying

C428S447000, C524S730000, C524S837000, C524S861000, C524S862000, C525S479000, C528S015000, C528S031000, C528S032000

Reexamination Certificate

active

06491980

ABSTRACT:

TECHNICAL FIELD
This invention relates to aqueous emulsions, to a process for preparing them, to materials preparable using these aqueous emulsions, to a process for coating organic fibers using such aqueous emulsions, and to textile substrates coated with these emulsions.
BACKGROUND ART
EP-A-758 666 describes aqueous emulsions which contain addition-crosslinking organopolysiloxanes and which are used for coating fabrics for airbags. However, these have the disadvantage that the combustion rate in the horizontal burn test of FMVSS 302 or 208 is too high.
SUMMARY OF INVENTION
It is an object of the present invention to overcome the disadvantages of the prior art and in particular to make available aqueous emulsions which, coated on a textile fabric, provide reduced flammability, especially in the case of airbags, and additionally have a low coating weight, an improved adhesion of the coating as demonstrated by improved values in the ISO 5981 scrub test, and which allow an economical coating process.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
The present invention accordingly provides aqueous emulsions comprising
(1) organopolysiloxanes containing SiC-bonded aliphatically unsaturated groups in terminal units,
(2) organopolysiloxanes containing at least 3 Si-bonded hydrogen atoms,
(3) a catalyst which promotes the addition of Si-bonded hydrogen to aliphatic unsaturation,
(4) organosilicon adhesion promoters,
(5) optionally silicone resins,
(6) an emulsifier,
(7) water, and
(8) carbon black.
The aliphatically unsaturated groups are preferably vinyl groups or allyl groups, in particular vinyl groups.
The diorganopolysiloxanes (1) according to the invention, which contain SiC-bonded aliphatically unsaturated groups in the terminal units, are preferably diorganopolysiloxanes having vinyl groups bonded to the terminal units, preferably those of the general formula
(CH
2
═CH)
x
SiR
3−x
—O(SiR
2
O)
n
SiR
3−x
(CH═CH
2
)
x
where
R denotes identical or different hydrocarbyl radicals with preferably 1 to 18 carbon atoms, which may optionally be substituted, and
x is 1, 2 or 3, preferably 1, and
n is a number such that the diorganopolysiloxanes (1) preferably have an average viscosity of 100-500,000 mPa·s at 25° C. Preference is given to the range of 200-200,000 mPa·s at 25° C. and particular preference to the range of 500-100,000 mPa·s at 25° C.
Examples of hydrocarbyl radicals R are preferably alkyl radicals such as methyl, ethyl, n-propyl, isopropyl, butyl, octyl, tetradecyl or octadecyl radicals; cycloaliphatic hydrocarbyl radicals such as cyclopentyl, cyclohexyl or methylcyclohexyl radicals; aryl radicals such as phenyl radicals; alkaryl radicals such as tolyl radicals; aralkyl radicals such as benzyl or phenylethyl radicals. Examples of substituted hydrocarbyl radicals are preferably halogenated radicals such as 3,3,3-trifluoropropyl, 3-chloropropyl or chlorophenyl radicals. Similarly, cyanoalkyl radicals such as the cyanoethyl radical, may be present. Radicals with unsaturated aliphatic groups such as, preferably, but without limitation, vinyl, allyl, hexenyl or cyclohexenyl, may likewise be present. R is preferably hydrocarbyl having 1-10 carbon atoms, and most preferably at least 80% of the organic radicals designated R are methyl radicals.
The organopolysiloxanes described above can be identical interpolymers or mixtures of different interpolymers with identical or different degrees of polymerization. If the diorganopolysiloxanes contain different diorganopolysiloxane units, the distribution may be random or block.
In the products of the invention, the diorganopolysiloxane (1) is present in amounts of 10-80% by weight, preferably in amounts of 20-60% by weight, more preferably in amounts of 20 to 50% by weight.
Organopolysiloxanes (2) with at least 3 Si-bonded hydrogen atoms are preferably those of the formula
(CH
3
)
3
SiO—(SiHRO)
o
—(SiR
2
O)
p
—Si(CH
3
)
3
where R may be as defined above and o/p is in a range of from 1:0 to 1:20, preferably from 1:0 to 1:7. The sum of o and p can be between 10-1000, it is preferably 20-200, particularly preferably 30-100. Identical or different organopolysiloxanes (2) can be used.
In the organopolysiloxanes (2) with at least 3 Si-bonded hydrogen atoms per molecule, the silicon valencies not saturated with hydrogen and siloxane oxygen atoms are preferably saturated with methyl, ethyl or phenyl radicals. However, all radicals described above as R can be present.
In the products of the invention, organopolysiloxane (2) is present in amounts of 1-40% by weight, preferably in amounts of 2-20% by weight, more preferably in amounts of 3-15% by weight.
Catalysts (3) promoting the addition of Si-bonded hydrogen to aliphatic unsaturation can be any desired catalysts which are known to promote this reaction. Examples of such catalysts are preferably metallic, finely divided platinum (platinum sol), ruthenium, rhodium, palladium or iridium. These metals may also be present applied to solid supports, such as silica, alumina or activated carbon, ceramic materials or mixed oxides or mixed hydroxides. Similarly compounds or complexes of these metals such as PtCl
4
, H
2
PtCl
6
.6H
2
O; Na
2
PtCl
4
.4H
2
O platinum-olefin complexes, platinum-alcohol complexes, such as Speyer's catalyst, platinum-alcoholate complexes platinum-ether complexes, platinum-aldehyde complexes, platinum-ketone complexes, such as the reaction products of cyclohexanone and hexachloroplatinic acid, platinum-vinylsiloxane complexes, in particular platinum-divinyltetramethyl-disiloxane complexes with or without organically bound halogen, bis(gamma-picoline)platinum dichloride, trimethylenepyridineplatinum dichloride, dicyclopentadieneplatinum dichloride, dimethylsulfoxydiethyleneplatinum(2) dichloride, and also the reaction products of platinum tetrachloride dissolved in 1-octene, with sec-butylamine. Platinum compounds are preferred for use as catalysts in the product of this invention. It is possible to use catalyst mixtures, or else only one kind of the abovementioned catalysts.
In the product of the invention, the amounts of catalyst used can be such that, in the case of platinum catalysts, the platinum content of the composition is preferably between 3 and 500 ppm, based on the siloxane content. Preference is given to using a platinum content of 10-200 ppm, based on the polysiloxanes used.
Aqueous emulsions can be prepared using any desired adhesion promoters. Examples of organosilicon compounds (4) useful as adhesion promoters are preferably silanes with hydrolyzable radicals and vinyl, acryloyloxy, methacryloyloxy, epoxy or acid anhydride groups bonded to silicon via carbon. It is also possible to use partial hydrolysates and/or mixed hydrolysates of such silanes. Preference is given to using a reaction product of vinyltriacetoxysilane and the silane of the formula
It is possible to use one type of adhesion promoter, or else mixtures of two or more silanes or their reaction products or partial or mixed hydrolysates. The adhesion promoter is preferably used in amounts of 1 to 20% by weight, preferably in amounts of 1 to 10% by weight, more preferably in amounts of 2 to 8% by weight.
The products of the invention may optionally include aqueous emulsions of silicone resins (5), preferably of the general formula (R
3
SiO
½
)
a
(RSiO
{fraction (3/2)}
)
b
, or MT resins and/or MQ resins of the general formula (R
3
SiO
½
)
a
(SiO
{fraction (4/2)}
)
b
, where R is as defined above and is preferably methyl, phenyl, vinyl or hydrogen. The ratio of a to b is chosen so that the silicone resins are within the viscosity range of 30-300,000 mPa·s at 25° C. Preference is given to using silicone resins within the viscosity range of 50-30,000 mPa·s at 25° C., more preferably within the viscosity range from 50 to 10,000 mPa·s at 25° C.
The organosilicon compounds used in this invention are commercially available products or preparable by processes customary in silicone chemistry, and in each case, may be one kind of such organosilicon compound or a mixtu

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