CN1173848C - Low permeability airbag cushioos having extremely low coating levels - Google Patents

Low permeability airbag cushioos having extremely low coating levels Download PDF

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Publication number
CN1173848C
CN1173848C CNB008016992A CN00801699A CN1173848C CN 1173848 C CN1173848 C CN 1173848C CN B008016992 A CNB008016992 A CN B008016992A CN 00801699 A CN00801699 A CN 00801699A CN 1173848 C CN1173848 C CN 1173848C
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Prior art keywords
airbag cushion
airbag
artificial rubber
cushion according
coating
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CNB008016992A
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CN1320089A (en
Inventor
李书龙
A・小索拉斯
约翰·A·小索拉斯
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Milliken and Co
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Milliken and Co
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Priority claimed from US09/335,257 external-priority patent/US6177365B1/en
Priority claimed from US09/350,620 external-priority patent/US6177366B1/en
Priority claimed from US09/501,467 external-priority patent/US7517570B1/en
Application filed by Milliken and Co filed Critical Milliken and Co
Publication of CN1320089A publication Critical patent/CN1320089A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
    • B60R21/16—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
    • B60R21/23—Inflatable members
    • B60R21/235—Inflatable members characterised by their material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/12—Layered products comprising a layer of synthetic resin next to a fibrous or filamentary layer
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
    • D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
    • D06N3/18—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof with two layers of different macromolecular materials
    • D06N3/186—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof with two layers of different macromolecular materials one of the layers is on one surface of the fibrous web and the other layer is on the other surface of the fibrous web
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
    • B60R21/16—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
    • B60R21/23—Inflatable members
    • B60R21/235—Inflatable members characterised by their material
    • B60R2021/23504—Inflatable members characterised by their material characterised by material
    • B60R2021/23509—Fabric
    • B60R2021/23514—Fabric coated fabric
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
    • B60R21/16—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
    • B60R21/23—Inflatable members
    • B60R21/231—Inflatable members characterised by their shape, construction or spatial configuration
    • B60R21/232—Curtain-type airbags deploying mainly in a vertical direction from their top edge

Abstract

Coated inflatable fabrics (26), more particularly airbags to which very low add-on amounts of coating have been applied, are provided which exhibit extremely low air permeabilities. The inventive fabrics are primarily for use in automotive restraint cushions which require low permeability characteristics (such as side curtain airbags). Traditionally, heavy, and thus expensive, coatings of compounds such as neoprene, silicones and the like, have been utilized to provide such required low permeability levels. Thus, the inventive coated airbag possesses a coating of at most 2.5 ounces per square yard, most preferably about 0.8 ounces per square yard, and exhibits a leak-down time (a meaurement of the time required for the entire amount of gas introduced within the airbag at peak pressure during inflation to escape the airbag at 10 psi) of at least 7 seconds. All coatings, in particular elastomeric, non-silicon coatings, and coated airbags, meeting these criteria are intended to reside within the scope of this invention.

Description

Low-permeable airbag cushion with few especially coating amount
Invention field
Generally speaking the present invention relates to cated inflatable fabric, relate to airbag cushion specifically, scribble the additional coatings of hoot on it and show low especially permeability to air.Inflatable fabric of the present invention is mainly used in the automatic buffer pad (for example side window airbag) that needs low ventilating performance.Normally, heavy and expensive, for example the coating of compounds such as neoprene (diene) rubber, silicone resin has been used to provide this required low-permeable.Cheap, the extremely thin coating of fabric utilization of the present invention provides this essential low ventilative level.Therefore, the inflatable airbag of coating of the present invention comprises the coating that is formed by a kind of (or multiple) elastomeric material that is coated on the target fabric, and wherein this elastomeric material has at least 140 tensile strength and at least 180% elongation at break.Then this coating with every sq m at the most 84.78 the gram (every square yard 2.5 ounces at the most) amounts be coated on this airbag surface (being preferably formed as film).Have returning to fall the time and (being defined as of at least 5 seconds after the airbag of the present invention inflation at 0.7kg/cm 2The airbag volume (10psi) after the inflation and the ratio of airbag volumetric leak speed).Resulting airbag cushion particularly has the low-permeable cushion of the packaging volume after very little the winding up, and all will drop in the scope of the present invention.
Background technology
The automobile airbag is widely known by the people and has used the quite a long time.Air bag structure material commonly used is polyester or nylon fabrics, scribbles for example elastomeric layer such as neoprene (diene) rubber or silicone resin.The woven fabric that the fabric that uses in these airbags is normally made by synthetic strings by textile operation as known in the art.
Have been found that cated material can receive, because it plays the barrier action that does not allow the inflation medium infiltration.Nitrogen, helium or other similar gas that this inflation medium is normally produced by gas generator or charging blower.This gas is sent in the cushion with higher relatively temperature.Coating prevents fabric air-permeability by these hot gas, thereby cushion is inflated in the collision case process apace and is not had undue decompression.
Airbag can also be made of the fabric that does not have coating that the mode with low-permeable product is weaved, or reduces the fabric formation of permeability to air through for example calender process.In U.S. Patent No. 4,921, the fabric (all quoting as a reference) that reduces permeability to air after woven by calendering or other mechanical treatments is disclosed in 735, No.4,977,016 and No.5,073,418 here.
It is reactive systems base or comprehensive two kinds of compositions that silicone coatings uses usually with the solvent.The normally every sq m 16.96-40.69 gram of the silicone coatings weight of traditional driver side airbag.Very different with chaufeur and passenger side airbag, the side window airbag that begins to occur in the twentieth century later stage nineties is used for protecting the rider in the side and the striking process of tumbling.The side window airbag has higher operation pressure usually, the more important thing is and in specific range of pressure, in certain time length, to keep inflated condition that this time length is at least than two orders of magnitude of gas filed longer duration of driver side or passenger side airbag.For the front and back sheet of side window airbag, the dry coating thickness of silicone resin all is about 101.73 to 135.65 gram scopes of every sq m or bigger.Any sacrifice in performance can not realize the lower coating weight of side window airbag.Will be understood that as those of ordinary skill in the art high added weight has improved the cost of airbag based fabric greatly, and is difficult to be packaged in the small air pockets module.In addition, silicone resin has low-down tensile strength and lower tear resistance characteristic, does not use very thick coating to be difficult to bear high-pressure aerated.
U.S. Patent No. 5 people such as Menzel, 110, in 666 (here the quoting as a reference) specific polyurethane is disclosed as coating, it is reported that the low added weight that allows is in the scope of every sq m 3.39 to 33.91 grams, but this material itself is relatively costly, and because the characteristic of coating material is believed the mixing and the coating processing that need relative complex.But the patentee fails to disclose any relevant elasticity and/or the tensile strength characteristic of their concrete polyurethane coated materials.In addition, be not coated on the importance discussion of ability on the new side window airbag (and relevant therewith low-permeable or fall the time for distinctive time) about this polyurethane with low added weight, these new side window airbags only are on the fabric that uses in chaufeur or passenger side cushion.All airbags must be able to be inflated very apace; In fact, in case sense collision, airbag reaches peak value air pressure usually in 10 to 20 milliseconds.Conventional driver side and passenger side airbag are designed to bear this huge inflation pressure; But in order to absorb the energy from car occupant collision airbag effectively, they are venting very apace also.Therefore this chaufeur and passenger side cushion (airbag) are made by the low-permeable fabric, but they are also connecting the linear slit place and exitting apace by air bleed hole.In addition, the low additional amount coating that discloses in the patent of Menzel and in people's such as Li U.S. Patent No. 5,945,186 does not provide long-term gas confining force; In fact prolongation and the continuous pressure that surpasses about 2 seconds at the most that is provided by the charging blower after activating can not be provided for they.Therefore the low-permeable of these air-bag fabrics is very little to the gas confining force that the continues help in chaufeur and the passenger's airbag cushion, and the gas confining force is for preventing that fully collision has the needed effect that makes the cushion venting.These air-bag fabrics can not worked well as the side window airbag, because form not coating of bolster connection linear slit shape, cushion shape structure (below will go through) at least in these airbags.Because it is quite serious that leak after the gas replenishment process neutralization in these zones, the low-permeable air-bag fabric of the above-mentioned low coating that patents can not correctly use in the side window airbag.
As mentioned above, the different airbags of three kinds of main kinds of existence, every kind all has different final uses.For example, the airbag of driver side is fixed in the steering-column tube usually, and shows higher permeability to air, is used for the cushion rubber of the chaufeur when conduct is subjected to impacting better.The airbag of passenger side also comprises higher airy fabric, allows or discharges gas by it or by the air bleed hole that is integrated in wherein.The airbag of all these types is designed to suddenly protecting the passenger in the collision, and (therefore has a plurality of " sides ") from steering-column tube or in the instrument carrier panel usually and explode out with the module that is packaged into.But; the side window airbag mainly has been designed to keep quite long time length by the inflated condition with it; open the packing container of in the collision of tumbling, protecting the passenger and within the side window along automobile is kept at the roof outline line, (also therefore only having rear side and front side) usually.Therefore the side window airbag not only has buffer action, but also prevents the injury of cullet and other fragments.Equally, the side window airbag is essential as mentioned above keeps a large amount of gas and anticyclonic pressure very, thereby keeps inflated condition in the long period of whole contingent rollover conditions.For realizing this point, the front and back side of these side cushions all scribbles a large amount of leakproofing materials usually.Since most of side window air-bag fabrics comprise make, leak free or whole woven spool blanks woven together, the discontinuity zone of potential serious gas leakage exists very at large, is positioned on the linear slit specifically and on every side.What need to accept is that the thick and heavy coating of requirement provides the needed low-permeable of side window airbag (and resultant long returning fallen the time) as a kind of.Do not have this thick and heavy coating, the venting fast easily of these airbags can not correctly be worked in the collision process of tumbling thus.Those of ordinary skills will understand well, and this thick and heavy coating has increased very big cost for the whole production of target side window airbag.Therefore there is very big demand to produce to have cheap coating the low-permeable side window airbag of (most preferably lower coating added weight), and when launching to use, can not damage needed aging, humidity of himself operation and permeability to air characteristic.So far, do not realize above-mentioned purpose substantially, if any, just reduce demand from this thick and heavy airbag coating of side window airbag.
In addition, there is a kind of side window airbag to be kept at current driver in the module of cylindrical shape with this low-permeable.Because these airbags are generally held in the roof outline line of automobile,, therefore press for the bare minimum that the packaging volume of the cushion of this compression is restricted to they so available area is quite limited always.But, proved that the low-permeable side window airbag of putting into practice the front is difficult to be kept at this columniform container on the roof outline line that is arranged in object vehicle.The needed actual of low-permeable object and energy and the packaging volume of self that wind up this thick and heavy band coating be difficult to have been reduced.In addition, for the use of this thick and heavy coating, when these objects are very closely packaging together, the problem of locking (that is, the different piece with the band coating of cushion bonds together) has been increased.When having potential latch-up problem, the chance that postpones in the gas replenishment process to launch increases.Therefore, press for side window low-permeable airbag very close packing, low packaging volume, low locking.It's a pity that prior art does not give airbag industry this advantage again.
Summary of the invention
According to the foregoing background technology, seen the demand of existence to the side window airbag of low-permeable, that this airbag uses is less, and therefore cheap coating amount, compares its packaging volume with the side window airbag of standard low-permeable type thus and reduces greatly.This cated low-permeable airbag should have required long returning to fall the time under the inflation and after long-time the preservation.The airbag of this novelty is compared with the airbag coating (with the airbag object that obtains) of the costliness of using in the past, high additional amount with novel coating formula has obvious improvement.
Therefore one object of the present invention is to provide a kind of cated airbag, and wherein this coating has low-down added weight, has long especially returning after the inflation and falls time response, and the auxiliary property that obtains thus is a low-permeable.Another object of the present invention provides a kind of cheap side window airbag cushion.A further object of the present invention provides a kind of coating agent of airbag efficiently, can use with low-down additional amount, obtains to inflate the low especially air bag structure of back permeability to air.Another object of the present invention provides a kind of airbag coating agent, and it not only provides useful and long low-permeable, also shows good long-time storage stability (by thermal ageing and humidity burn-in test).A further object of the present invention provides the low-permeable side window airbag in the roof outline line that is kept at automobile, has the low-down characteristic that winds up packaging volume and do not have locking for permanently effective preservation.
Therefore, the present invention relates to a kind of airbag cushion that comprises the coating fabric, on the wherein said fabric with every sq m fabric quantity coatings artificial rubber complexs of 84.78 grams at the most; And wherein said airbag cushion shows distinctive time of at least 5 seconds and falls the time after preserving for a long time.Equally, the present invention relates to a kind of airbag cushion that includes coated fabric, scribble the artificial rubber complex on the wherein said fabric; Wherein said artificial rubber complex comprises at least a artificial rubber with degree of stretching of at least 105 tensile strength and at least 180%; And wherein said airbag cushion shows distinctive time of at least 5 seconds and falls the time after preserving for a long time.In addition, the present invention includes a kind of airbag cushion of band coating, the packaging volume coefficient after it winds up be at least 17 (be measured as airbag cushion the fabric that does not wind up length with wind up after the ratio of diameter).
Term " distinctive time fall the time " is meant the measurement of the pressure attenuation characteristic of side window airbag after the airbag inflation reaches the peak value operation pressure.This pressure attenuation curve of side window airbag is very similar to accurate exponential decay curve, wherein uses simple time constant to characterize entire curve.The distinctive time time of falling of Shi Yonging is used as the time constant of the pressure attenuation of describing airbag in the present invention.This is measured afterwards with 0.7kg/cm 2Constant pressure inflate again, inflate (the highest initial gas pressure that reaches " opening " weak sealing area) at one and the airbag cushion of exitting in the needed Measuring Time of charge air conditioning of the entire quantity introduced.In airbag field (being particularly related to side window (low-permeable) airbag cushion), know and be well understood that the long confining force of charge air conditioning is most important in collision process.The side window airbag is designed to equally with airbag passenger side inflate with driver side fastly, but they must be exitted very slowly tumble and the process of side in protection people by bus.Therefore, in continuous fast speed gas replenishment process, after airbag reached peak pressure, the gas leakage speed of this airbag must be very low.Therefore, the coating on the airbag must be enough solid to bear impact and the pressure when the such fast aeration of airbag.Therefore, in order to keep the gas that benefits the formation cushion of maximum quantity in the airbag, it is very important that time measurement falls in peculiar time of growing.Therefore after the inflation airbag of (with reaching after the peak pressure) leaks with actual air pressure confining force characteristic closely related.Can fall time t by peculiar time and describe air pressure confining force characteristic (being referred to as " return and fall the time " later on) gas filed and the side window airbag of exitting, wherein:
Figure C0080169900111
*SCFH: standard cubic foot per hour
Be to be understood that constant 0.7kg/cm 2It or not limitation of the present invention; But only be under this constant pressure, to measure back the time of falling.Therefore, even in the gas replenishment process of reality or at the initial pressurization downstream pressure of airbag, be higher or lower than this value, only restriction be if those skilled in the art prepare to measure the airbag volume and with the bag volume divided by the volume leakage rate (by at 0.7kg/cm 2The takeoff that the target airbag leaks in the gas filed process of following stabilized conditions is arrived), the time of outcome measurement will be at least 5 seconds.Preferably, this time is greater than about 9 seconds; More preferably, greater than about 15 seconds; And most preferably, greater than about 20 seconds.
In addition, do not have in the metering system of gas filed side window airbag in utilization, term " return fall the time " can be measured to be become after reaching initial peak pressure, and the charge air conditioning of introducing is discharged half needed time quantum from the target airbag.Therefore, utilizing standard modes of inflation (for example, normally about 2.1kg/cm 2) when inflating, reach the peak value initial pressure and begin this measurement afterwards immediately.Will be understood that reaching the gaseous tension that is pushed in the airbag after the peak value initial pressure will not keep stable (it reduces) in the process of introducing charge air conditioning subsequently, and the target airbag will make inevitably the charge air conditioning of some overflow in this process.The main task of this side window airbag (as mentioned above) is to keep inflated condition as far as possible for a long time, thereby provides enough cushion rubber protections to the people who rides in the overthrow accident process.The quantity of the gas that retains is big more, and the cushion rubber effect that provides to the passenger is good more.Therefore, the time of the charge air conditioning that the airbag maintenance is a large amount of is long more, and it is long more that the time falls for distinctive time in the result, thereby the cushion rubber effect that realizes is good more.In any case airbag of the present invention must be after reaching the peak value initial pressure, at least 25% of its gas volume that charges gas of major general, preferably 50% or higher maintenance 5 seconds.Preferably, this time is 9 seconds, more preferably 15 seconds, and most preferably 20 seconds.
Equally, term " after long-time the preservation " comprises except that wait for the inflation the actual preservation in the inflator assemblies (module) of airbag cushion of the present invention in automobile in preservation equipment.This measurement usually for those of ordinary skills can accept, fine being appreciated and understood that, can be undertaken by comparative analysis afterwards in representative type heat and humidity burn-in test (ASTM D 5427).These tests of being adopted by this area are usually included in 107 ℃ the baking oven aging 16 days, then wear out 16 days under 83 ℃ and 95% relative humidity, and generally believe that this is the correct estimation to the long preservation condition of airbag cushion.Therefore, this term comprises these experiment with measuring.Air-bag fabric of the present invention must be expressed correct distinctive time and fall the time after preserving test through the simulation of this strictness.
The detailed description of invention
Artificial rubber coating composition of the present invention must comprise at least a 105kg/cm at least that has 2Tensile strength and greater than the artificial rubber of about 180% elongation at break.Preferably, tensile strength is 210kg/cm at least 2, more preferably 280, and most preferably about at least 350.Preferred elongation at break is greater than about 200%, more preferably greater than about 300%.That these characteristics of artificial rubber convert to is not only very solid (and bear thus in gas replenishment process and the huge pressure after the inflation and be not easy fracture) but also can extend the coating that compensates this huge inflation, pressure etc.Therefore, when being coated with application layer on other parts of the linear slit place of side window airbag and air bag structure, this coating most preferably (although optional) forms continuous films.This coating is used for both filling the single hole between weaving yarn and/or stitch, again each yarn " is cemented " on the position.In gas replenishment process, this coating prevents to pass the leakage of the void space between yarn then, helps to prevent yarn skew (this will form the bigger space that can overflow gas).
The use of this high-tensile and high elongation at break parts makes that the added weight of this film of use was very low afterwards.Usually, the needed coating that is positioned on the side window airbag is very high, and every sq m is 118.69 grams (utilize this standard in fact higher, be approximately 135.65) at least.Every sq m only needs at the most the coatings of the present invention of 84.78 grams (preferably every sq m is less than for example about 67.82 grams on each face of airbag cushion of the present invention, more preferably be about 61.04, further preferably about 50.87, and most preferably be low to moderate 27.13 grams), return the time of falling (low-permeable) thereby form desirable length.In addition, the coating in past requires to have excellent heat and humidity aging stability.Beyond thought is even that in this low additional amount, particularly the problematic coating material of utilization use in the past (for example, polyurethane) time, coating of the present invention, and the airbag cushion of coating of the present invention subsequently show excellent thermal ageing and humidity aging characteristics.Therefore, in this concrete airbag field, the airbag of this coating composition and coating has obvious improvement.
As the artificial rubber composition in the artificial rubber complex of the present invention interested especially be polyamide, polyurethane, acrylic synthetic rubber, hydrogeneous nitrile rubber (promptly, hydrogeneous NBR), butyl, EPDM rubber, viton (that is, fluoropolymer and the copolymer that comprises fluorine monomer), vinyl benzene copolymer and vinyl propylene copolymer.Equally, this artificial rubber can cross coupled or non-cross coupled on the airbag surface.Preferably, this artificial rubber is polyurethane and polycarbonate polyurethane elastomer most preferably.This complex can obtain from Bayer Corporation, and commodity are called Impranil , comprise Impranil 85UD, ELH and EHC-01.Other acceptable polyurethanes comprise the Bayhydro1123 that obtains from Bayer equally The all Ru41-710 that obtains from Stahl USA, EX51-550 and Ru40-350.Yet any polyurethane or artificial rubber with same tensile strength recited above and elongation at break characteristic can use in coating formula of the present invention and on the airbag cushion of coating of the present invention well.But, as required actual tensile strength and elongation at break, the added weight of other utilizable films can preferably be worth greater than this.But, should not exceed the upper limit that satisfies every sq m 84.78 grams of the present invention.But if desired, only otherwise exceed the needed thickness of whole coating, just can add desirable artificial rubber with a plurality of layers.In addition, as long as use at least one to have the artificial rubber of needed tensile strength and elongation at break, also can use a plurality of layers coat system.
Other compositions that can occur in these artificial rubber coating compositions are thickening agent, antioxidant, fire retardant, cementitious agent, adhesion promoter and colorant.According to potential preferred practice of the present invention, dispersoid of the artificial rubber resin of meticulous distribution (can be moisture or solvent-laden according to the artificial rubber of selecting) or resin solution mix with fire retardant, and the synthetic mixture with about 8000 centipoises or bigger viscosity is provided.Polyurethane is potential preferred, and the polycarbonate polyurethane that obtains from Bayer and Stahl wherein for example above-mentioned is most preferred.Other potential artificial rubber resins comprise other polyurethanes, for example the Witcobond that obtains from Witco TM253 (35% solids) and from BFGoodrich, the Sancure that Cleveland, Ohio obtain; Hydrogeneous NBR, for example from Goodyear Chemical, the Chemisat that Akron, Ohio obtain TMLCH-7335X (40% solid); EPDM, for example from LordCorporation, the EP-603A elastomer latex that Erie, Pennsylvania obtain; Butyl, for example the Butyl elastomer latex BL-100 that obtains from Lord Corporation; And acrylic rubber (artificial rubber), for example HyCar that obtains from BFGoodrich TMThis tabulation should not regarded as and comprise that all this only is giving an example to possible artificial rubber.In addition, this preferred artificial rubber does not comprise any silicone resin, (is usually less than about 105kg/cm because this bill of material reveals low-down tensile strength 2) characteristic.But in order to provide actv. aging and non-locking advantage, these compositions can be used as external coating and affact on the artificial rubber, as long as the added weight of whole artificial rubber and external coating is no more than every sq m 84.78 grams.In addition, because heat and the humidity stable problem (easy in a humid environment hydrolysis of polyester and polyethers are being pined for easy oxidation) in aging; So comprise that the artificial rubber of polyester or polyethers section (for example polypropylene oxide) or other analogous components is undesirable, particularly with low-down added weight (that is 0.8-1.2oz/yd, 2); But this artificial rubber uses in the coating formula outside, as long as be no more than every sq m 84.78 grams.
Other preferred additives in this artificial rubber complex are heat stabilizer, fire retardant, priming paint adhesives, anti-locking preparation and the material that is used for protecting external coating.Potential preferred thickener is that the registered trade mark (RTM) by the Aqualon ancillary firm production of Hercules Corporation is NATROSOL TMThe product of 250HHXR is be sure of the said firm at Wilmington, and Delaware has and sells a little.In order to satisfy the requirement of the fire retardant in 320 pairs of auto-industry of Federal Motor Vehicle Safety Standard, also preferably fire retardant is appended in the compound compound.A kind of potential preferred fire retardant is the AMSPERSE F/R51 that is sold by Amspec Chemical Corporation, be sure of that it has at Gloucester City New Jersey to sell a little.Can use the priming paint adhesives to promote bonding between the surface of target fabric and the artificial rubber itself.Therefore, although the whole coating that preferably contacts with fabric face for artificial rubber is the monoblock parts, can utilize adhesion promoter, for example isocyanate, epoxy resin, function silane and some other resin with adhesion property do not offer the needed low-permeable of target airbag cushion and can not influence artificial rubber nocuously.Can be before coating high-strength artificial rubber coating of the present invention, the primer coating that will have adhesive ability directly is coated onto on the fabric, thereby guarantees bigger cohesive resistance.
Owing to have potential silicone resin recited above, the external coating parts can also be used to realizing the suitable non-latch-up characteristic of target airbag cushion.The artificial rubber (silicone resin or the polyurethane that comprise specific grade) that great majority are suitable for the sealed sides window construction has higher skin friction force and locking under higher temperature easily.Higher skin friction force will delay the expansion (opening/untie) of airbag and the safety that is provided by airbag will be provided.Present side window airbag uses non-woven fabric at the top of silicone coatings, provide needed low-frictional force except not locking advantage is provided also.But non-woven fabric has increased packaging volume and total cost significantly.Have been found that the artificial rubber that the very big and softening point of hardness is very high now as top coat, can realize that cost is lower, the surface of the improved not locking of packaging volume and low-frictional force.Can also realize softening of higher hardness and Geng Gao by utilizing the cross coupled effect preparation in the external coating.Suitable cross coupled effect preparation is melamine formaldehyde resin, polyurethane (bifunctional, three functions with multi-functional), epoxy cross coupled resin, polyaziridines, carbodiimide cross coupled resin, phenol formaldehyde resin, urea-formaldehyde resin or the like, but is not limited thereto.By using hardness and the very high top coat of softening point attribute, can realize coefficient of sliding resistance (measuring) according to ASTM D4518 test method B less than about 0.7.This external coating can also be realized multiple other functions, comprises aging (for example the utilizing silicone resin) of improving the artificial rubber coating or further reinforces artificial rubber coating material (be apparent that most and utilize preferred polycarbonate polyurethane), but be not limited thereto.Therefore except silicone resin, can from one group of organic polymer body resin, select top layer material, in case when applying these materials and these material cured, just have higher softening point and hardness.These examples of material are polyurethane, polyacrylates, epoxy resin, vinyl acetate copolymer, fluoropolymer, polyamide and polyester.
In order to use in buffer system, air-bag fabric must pass through specific test.A kind of test like this is referred to as locking test, represent coating fabric two parts in contact preservation (for example airbag preservation) for a long time each other afterwards, with these two parts needed power that is separated from each other.The test analysis of locking must be with the air-bag fabric sample of the coating side of two 5.08 cm x 5.08 centimetres (2 inches * 2 inches) with 0.35kg/cm 2Under 100 ℃, pressed together 7 days.If after this time two samples are torn needed power greater than 50 grams, the gravity that perhaps utilizes 50 grams to be suspended on the bottom fabric separates the needed time greater than 10 seconds with these fabrics, then this coating impassabitity locking test.Obviously, it is more little to separate needed shearing force, and coating is good more.For the locking resistance after improving (and reduce thus between the each several part of fabric packaging together inappropriate chance of adhering to), the external coating part can be used for example talcum, silica, silicate clay and starch, as long as the added weight of total artificial rubber composition (comprising external coating) is no more than every sq m 84.78 grams (and most preferred with lower value appearance, for example about 50.87).
Other two kinds of tests that the airbag cushion of specific coating must be passed through are the aging and humidity burn-in tests of baking oven (heating).These tests are also simulated air-bag fabric and are preserved through long under high temperature tans by the sun with under the relative high humidity.After in fact these tests are used for analyzing the long preservation that (has or do not have moist condition) through 2 or more weeks in hot draft furnace (＞100 ℃), the attribute change of various different fabrics.For the present invention, this test is mainly used to fall the time permeability to air that (going through as top) comes the cated side window airbag of analytic band by measuring distinctive time.Original airbag cushion of the present invention of producing and preserving should show to fall the time greater than about 5 seconds distinctive time and (has been inflated in advance at airbag and has been approximately higher than 1.05kg/cm greatly under the preservation condition of this strictness 2Peak pressure and allow after all venting, with 0.7kg/cm 2Gaseous tension when inflating again).Because polyurethane, preferred artificial rubber may be subjected to unfavorable (although do not resemble specific polyester and contain the artificial rubber of polyethers harmful) influence of high temperature and high humidity among the present invention, should append to special component in the external coating modestly and/or artificial rubber itself in.Antioxidant, antidegradant and metal deactivator can be used for this purpose.For example comprise but should not be limited to, from the available Irganox of CIBA Specialty Chemical 1010 and Irganox 565.This external coating can also provide aging-resistant extra protection; therefore can comprise the aging material that improves of external coating; for example; but be not limited to; polyamide, NBR rubber, EPDM rubber, polyurethane, melamine formaldehyde resin, urea-formaldehyde resin, polyacrylates, silicone resin, polyacrylates, fluoropolymer or the like are as long as the artificial rubber composition is no more than the added weight of the target fabric of every sq m 84.78 grams (preferably at the most much smaller than about 50.87).
Other additives that can appear at the artificial rubber complex comprise that colorant, ultra-violet stabilizer, filler, pigment and cross coupled/curing agent etc. are as known in the art, but are not limited thereto.
Also note that silicone resin can affact in the specific airbag of the present invention, as long as these airbags with silicone resin guarantee to fall the time than distinctive time that grows.
Usually use the scraping coating process that the silicone coatings of standard is adhered on the conventional air-bag fabric (chaufeur and passenger side airbag).Because the higher point of the yarn on scraping painting cloth-knife and the target fabric remains and contacts, the thickness of the coating that obtains on fabric face is very inequality or form discontinuous film.Thin point becomes the potential defective of in gas replenishment process formations and has the thin spot of high leakage rate in the coating that obtains like this.
But because the fabric face topology is inhomogeneous, the coating process of continuous film is most preferred so can form relatively uniformly with good adhesive ability on the surface of target fabric.The coating program of the fixed interval (FI) result that offers the best.This coating is handled and is comprised that cutter scrapes-cover-scroll, scroll-covering-scroll etc.Can also use transfer roll coating process (for example color reverse roll, calender roll and gravure roll or the like), because this method can provide continuous and uniform coating on fabric.As long as they provide good adhesive ability, extrusion coated and finedraw film coating process also can use.Resin solution in the fixed interval (FI) coating program or dispersoid are preferred.For same dry coating weight, the resin system of the adjust the clearance that resin solution or dispersoid use much larger than 100%.The gap is set the high more film that obtains and is had uniform more coat thickness.The most preferred resin solution that is to use is because it provides better film to form step (the resin dispersion body needs resin particle combination completely to form excellent film).
On it, apply the neoprene coating and form the substrate of airbag of the present invention basic fabrics, most preferably by comprising for example woven fabric that forms of the yarn of polyester or polyethers of syntheticfibres.This yarn preferably has about 105 dawn to the linear density at about 840 dawn, more preferably is about 210 to about 630 dawn.This yarn is preferably formed by many filaments, and wherein these filaments have every about 6 dawn of filament or littler linear density, and every about 4 dawn of filament or littler most preferably.In embodiment more preferably, this basic fabrics should be formed by nylon fiber, and nylon 6,6 most preferably.Have been found that when using jointly this polyester material shows good especially adhesive ability and prevents the hold facility of hydrolysis with coating of the present invention.This basic fabrics most preferably utilizes at the U.S. Patent No. 5,503,197 and the No.5 that belong to people such as Bower, the disclosed jet-propelled weaving loom weaving of flowing in 421,378.This woven fabric is referred to as airbag basic fabrics later on.As mentioned above, airbag of the present invention must show low especially permeability to air and must be to be referred to as " side window " airbag.Such as has already been described in detail, in order to provide suitable long cushion rubber protection to the passenger in the process of overthrow accident, this side window airbag (also being called cushion rubber) must keep a large amount of charge air conditioninies in collision process.The side window airbag of any standard all can be used in combination with the coating of low additional amount a kind of product is provided, and it shows needed aforesaid time and falls the time.Most side window airbags are by arduous, intensive making or sewing up (or other modes), two independent woven fabric base substrates are joined together to form can gas filed structure make.In addition, as one of ordinary skill in the understanding, carry out this making in the position of key and form linear slit (each of fabric layer between point of connection), next this linear slit is formed on the discrete open area that charge air conditioning can flow in the gas filed process.Therefore these open areas form the structure of bolster shape in final gassiness airbag cushion, so that more surf zone is provided in collision process, and for airbag self provides intensity, thereby bear very high internal inflation pressure (and therefore in this inflation event procedure, not exploding).For the side window airbag that has been sewn into, the coating of the present invention at the linear slit place that is coated on the smooth fabric side and is sewn into provides good combing resistance at the linear slit place that is sewn into, and makes linear slit and fabric all have lower permeability to air.Other side window airbag cushion occur with the woven form of different single-pieces.Generally speaking, by two independent tissue layer woven linking together of while (similarly, forming the structure of needed bolster shape) being formed some inflatable airbag at specific key position.Therefore these mats have bonded assembly linear slit between two layers.It is above-mentioned in gas replenishment process or the problem of gas loss afterwards to exist so multi-thread seam (all existing in polylith and woven airbag monolithic) to produce.Yarn may be offset, particularly at yarn with multitude of different ways and quantity skew part, overflow the quick venting that produces airbag fast by charge air conditioning thus.Therefore, airbag basic fabrics does not provide more help at reduction permeability to air (falling the time with relevant returning, particularly with high relatively air pressure) aspect.This in the past linear slit problem has mainly proposed to use very thick and heavy and expensive coating to satisfy the needs of essential low-permeable.
Recently, no matter be the side window airbag (it needs very a large amount of arduous intensive making to connect woven cloth blank) of polylith, still the woven cushion of traditional monolithic of making has all been obtained progress, for the woven cloth of monolithic more particularly, its floating silk between weaving yarn reduces significantly, thereby in the unbalanced skew that has fundamentally reduced at the inflated condition yarn under working, for example belonging to Sollars, Jr. patent Ser.No.09/406, in 264, this specification sheets is all quoted at this.The woven airbag of these monolithics is made on lift dobby loom or jacquard fluid jet loom usually, and preferably employed monolithic airbag is made by the woven processing of jacquard.Utilize this improvement, the possibility of the higher leakage at linear slit place reduces greatly.These airbags provide the point of connection place between two-layer fabrics and the machine-knitted structure of balance on every side thereof, make to compare with the woven airbag of the monolithic of standard, reduce in the high-pressure aerated condition yarn under working out-of-position ability that becomes.Because the floating silk freedom of having improved to its significant effective and the linear slit structure of balance are so the machine-knitted structure of this monolithic can obtain the low-permeable effect with additional amount artificial rubber coating seldom.In fact, utilize every sq m less than 50.87 and be low to moderate about 27.13 the gram low additional coatings, these airbags of the present invention are very well worked.
In addition, although it is not preferred in the present invention, but have been found that coating composition of the present invention for the woven airbag of standard monolithic provides similar low-permeable advantage, particularly utilize high-tensile, the high elongation at break of low additional amount of the present invention and do not have the coating of silicone resin; But, form long return needed coating of time is fallen and quantity far above above-mentioned Sollars, the monolithic machine-knitted structure of Jr. invention.Therefore, for the woven airbag of these other monolithics, for realizing suitable low-level permeability to air, every sq m may need 40.69 even reach the additional amount of about 74.61 grams.Even utilize the coating of so high additional amount, coating of the present invention itself is compared with coatings such as silicone resin of the prior art standard, that market is on sale (must exist with the quantity of every sq m at least 101.73 grams), has obvious improvement significantly.
In addition, find that also film coating composition of the present invention has and the above-mentioned same advantages such as side window airbag of making, sew up formation with additives amount of the present invention etc.Do not connect the potential high-leakage at linear slit place although do not wish very much this structure at these, but have been found that silicone resin neoprene (diene) the rubber coating prescription low additional amount of utilization than standard, the permeability to air of coating of the present invention obviously reduces (in fact reach acceptable and return the time of falling).This additional amount will reach the limit of every sq m 84.78 grams, but according to directly with in the target fabric surperficial film coating composition that contacts using, the artificial rubber composition of sufficiently high tensile strength and enough elongation abilities, verified lower quantity (for example, every sq m 50.87 grams) is actv..Equally, possibility with reduction coating material (always very expensive usually) quantity, meanwhile, make the target air bag structure have quite low permeability to air, high moisture-resistant ability and the aging stabilizing power of special actv., the airbag of coating composition of the present invention and coating of the present invention itself obviously is significantly improved than airbag coating tool of the prior art.
Surprisingly, coating of the present invention can also be coated on the side window airbag valuably with structure not too closely.Traditional woven side window airbag uses woven fabric very closely to guarantee to reduce the possibility of linear slit combing, makes the stress on the coating of effect less.For example, the common woven airbag of 420 dawn Jacquard monolithics has the structure of per 2.54 centimetres of 54-57 yarns.Compare with it, use 420 same dawn yarns, common driver side and passenger side air-bag fabric have the structure of per 2.54 centimetres of 39-49 yarns.In fact coating of the present invention utilizes 420 dawn yarns to make the permeability to air of fabric very low with the tight structure less than per 2.54 centimetre of 54 yarn.High-strength coating of the present invention and the combination of low structure obtain the better packaging volume of the fabric of woven faster speed, fiber consumption still less, more resilient fabric, coating, littler package weight and lower total cost.For fabric, may realize needed lower overall air permeability or fall the time for distinctive time by more high-intensity material or higher coating weight with fairly simple structure.
Main emphasis among the present invention is to be packaged in the cylindrical preservation container at the roof outline line place that is arranged in object vehicle with the airbag cushion of coating with as far as possible little volume.In the structure after one winds up (in order most preferably to be engaged in the hydrostatic column itself; and thus in order when crashing, most preferably to inflate; coming provides sufficient protection to the passenger), the length of the fabric when airbag of the present invention can be defined as not winding up of the cylindrical of the diameter that has at the most 23 millimeters and～43 centimetres.In this example, the cylinder roof profile with 2 meters long is preserved container, and the volume that this container needs approximates 830 cm3s, and (this volume is calculated as length * [π] * (radius) 2).For market side window airbag cushion on sale, the packing diameter after the winding up of standard is 25 millimeters (because the thickness of the needed coating of low-permeable feature are provided) at least.Therefore, the volume of the hydrostatic column of Xu Yaoing should be 980 centimetres at least 3Preferably, the diameter after airbag cushion of the present invention winds up in the preservation process is 20 millimeters at the most, and (volume after the packing that obtains is approximately 628 centimetres 3), be lower than the standard pack volume significantly.And, with the inflation after airbag cushion the degree of depth (promptly, reach downwards along the object vehicle one side length of the nadir of window for example from the roof outline line) relevant, the ratio of the diameter after the packing after the degree of depth of airbag cushion of the present invention (being 17 inches or 431.8 millimeters basically under normal conditions) winds up with it should be about 18.8 at least.Preferably this ratio should be 21.6 (20 mm dias) approximately and should be 24 (having about 18 millimeters minimum diameter) approximately in its maxim.Certainly, the scope of ratio needs not be the degree of depth of 431.8 millimeters standard, and it is the function of coat thickness and this added weight basically.
Another advantage of using side window airbag of the present invention to obtain is to use the charging blower of low pressure.In the past, only when inflation pressure was very high, the coating that is coated with (thicker relatively, promptly every sq m 135.65 grams for example are the preparation of base with the silicone resin) made the side window airbag carry out effective seal and makes it keep enough gas.Because higher inside peak pressure is introduced a large amount of charge air conditioninies very apace in the target airbag, can realize that the target airbag keeps inflated condition, make the inflated condition of this airbag keep long time, be enough to play the effect of cushion.It's a pity that although satisfy needed inflationtime value and remaining gas volume, these values are all very low basically and be in the minimum of needed eigenwert.Side window airbag of the present invention is compared with this traditional airbag that scribbles silicone resin, has tangible improvement at gas confining force and inflationtime (that is, falling the time for distinctive time) aspect.Final user can utilize this lower inflation pressure (that is 1.05-1.4kg/cm, 2And may be lower), the side window airbag after the inflation still is provided, keep enough inflated conditions so that maximum cushion effect is provided in the collision process of tumbling for a long time.The ability of the less charging blower of this use changes into better safety (lower power output, in gas replenishment process, provide better safety owing to be not easy to cause serious injury) to the automobile rider, more cheap charging blower, the charging blower of small size and the time need bear the airbag and the fabric of low physics requirement more in inflation.
Describe and disclose the present invention though interrelate with specific preferred embodiment and practice, but the present invention is not limited in these certain embodiments, but cover the equivalent of cooresponding structure, structure and the embodiment and the distortion of all changes, and can limit by the scope of appended claims and suitable content.
Detailed description of preferred embodiment
Pleasurable is to disclose some and had 105kg/cm at least 2Tensile strength and the artificial rubber of at least 180% elongation at break, 84.78 restrain at the most with every sq m, preferably 27.13 and .67.82 between, more preferably from 27.13 to about 50.87, further preferably from 27.13 to about 40.69, and the weight coated of about 27.13 grams of most preferably every sq m is on two surfaces of side window air-bag fabric, is provided at when inflation and has the airbag cushion (all having passed through long locking test and long baking oven burn-in test) of the coating of low-down and the permeability to air that prolongs afterwards.Therefore this unexpected a plurality of useful coatings form a kind of airbag cushion, be easy to inflation after long-time the preservation, and keep inflated condition in the sufficiently long time, to guarantee security level optimum in the buffer system.In addition, unquestionable needed film coating composition is few more, and final product is cheap more.In addition, the minimizing of the quantity of needed coating composition will be converted into the reducing of packaging volume of air-bag fabric in the air bag apparatus.Therefore this helps to improve the capacity packing of air-bag fabric.
Preferably produce artificial rubber complex of the present invention according to following Example.
The moisture artificial rubber complex of table 1 standard
Composition Proportioning (/ whole compositions)
Resin (solid that in water, contains 30-40%) 100
Natrosol  250 HHXR (thickening agent) 10
Irganox  1010 (stabilizer) 0.5
DE-83R (fire retardant) 10
(in the concrete resin tabulation table 2 below, and only add in this standard complex thus, form the preferred embodiment of coating agent of the present invention) with the quantity in the table.
The viscosity that measures this complex after synthetic by the Brookfield fluid meter approximately is 15,000 centipoises.In case finish synthetic, handling (gap between applicator and airbag surface is to approach 100 microns ultimate range) by the fixed interval (FI) adheres to said preparation as top Sollars, Jr. on two faces of the woven airbag of the Jacquard of the monolithic of discussing in the specification sheets (wherein having 420 dawn nylon, 6,6 yarns).Airbag is at higher temperature (about 300 about 3 minutes) dry solidification and form needed shallow layer thus down then.As mentioned above, next can also carry out scratch coating so that needed film coating to be provided, still, being coated on of fixed interval (FI) provides desirable uniform thin-film width and is preferred therefore on the airbag surface.In this case, scratch coating comprises that cutter scrapes the coating method, specifically is that cutter is scraped-covered-the gap platform, floating scraper and cutter scrape-cover-form the foam spacer method, but be not limited thereto.Coating at the preferably every sq m about 20.35 of the later final weight of drying to about 84.78 grams or littler and most preferably every sq m 27.13-40.69 gram or littler.When according to ASTM test D737 " AirPermeability of Textile Fabrics " canonical measure, the airbag cushion that obtains is airtight basically.
Table 2 standard contain solvent artificial rubber complex
Composition Proportioning (/ whole compositions)
Resin (solid that in solvent, contains 25-40%) 100
Irganox  1010 (stabilizer) 0.5
DE-83R (fire retardant) 10
The coating that obtains with the same mode effect of moisture artificial rubber as described above.
In order to further specify the present invention, provide following indefiniteness for example.These examples only are used to illustrate preferred embodiments more of the present invention and can not regard as by any way and limit the scope of the invention.These examples relate to the combination of the coating agent in following preferred artificial rubber and the top table 1 and 2.
The airbag of each coating at first carries out the fast speed inflation and reaches 2.1kg/cm 2Peak pressure.Then at 0.7kg/cm 2Pressure is measured the escape of air (SCFH) of the airbag after the inflation down.On the long-pending basis of the gentle bag of leakage rate, calculate and fall the time (second) distinctive time.
Example sequence number/artificial rubber Tensile strength (kg/cm 2) Elongation at break (%) Time t (second) before aging Time t (second) after aging Coating added weight (restraining every sq m)
?1.Impranil?85?UD ?420 ?400 ?18.1 ?16.3 ?27.13
?2.Ex?51-550 ?217 ?320 ?110.2 ?105 ?27.13
?3.Impranil?ELH ?504 ?300 ?120.2 ?125 ?30.52
?4.Ru?41-710 ?490 ?600 ?27.3 ?26.4 ?27.13
?5.Ru?40-350 ?490 ?500 ?34.4 ?36.2 ?27.13
?6.Bayhydrol?123 ?420 ?300 ?8.6 ?5.7 ?27.13
?7.Dow?Cornig?3625 *** ?49 ?90 ＜2 ＜2 ?71.21
?8.Silastic?94-595-HC ** ?98 ?580 ＜2 ＜2 ?61.04
?9.Ru?40-415 ?350 ?180 ＜2 ＜2 ?27.13
?10.Sancure?861 ?210 ?580 ?25.2 ＜2 ?27.13
?11.Witcobond?290H ?420 ?600 ?28.4 ＜2 ?27.13
*: aging condition: 107 ℃ of baking ovens aging 16 days down, wore out 16 days under 83 ℃ and 95% relative humidity then.
*: this resin is a silicone rubber.
Therefore as mentioned above, the performance of example 1-6 is good especially and be located within the scope of the present invention.Example 10 and some restrictions of 11 expressions show excellent thermal ageing (oxidation) stability based on the artificial rubber (Witcobond 290H) of polyester, but easy hydrolysis under higher humidity; With the polyethers is that basic artificial rubber (Sancure 861) has excellent anti-hydrolysis ability, but oxidation resistance is relatively poor.But verified these artificial rubber are the little materials of acceptable permeability to air under the higher added weight under the maxim that is lower than every sq m 84.78 grams.In addition, although silicone resin shows the ability of excellent resistant to thermal aging and hydrolysis (humidity is aging), they have limited tensile strength and anti-shearing resistance.Natural rubber, SBR, chloroprene rubber and other rubber that contains the two keys of unsaturated carbon have excellent anti-hydrolysis ability.But make the two easy oxidizers of key of their rubber-like unsaturated carbons, thermal ageing is handled the back rubber property and is changed.Having the good physical attribute and the anti-hydrolysis of excellence and the artificial rubber of oxidability is preferred for this application.Polyurethane based on the softening section of polycarbonate is preferred for this application.
The coefficient of sliding resistance of airbag is constant 0.6 basically in the example 3.The side window airbag that has thick silicone coatings that comprises the non-knitting layer has about 0.8 steady state value by comparison.
The explanation of accompanying drawing drawing
Fig. 1 represents to use side, the interior views of side window airbag of the present invention vehicle before.
Fig. 2 represents to use side, the interior views of side window airbag of the present invention vehicle afterwards.
Fig. 3 represents the lateral plan of side window airbag;
Fig. 4 is the lateral plan of side window airbag container;
Fig. 5 is the cutaway view that is kept at the airbag in the container of Fig. 4.
The detailed description of accompanying drawing
As shown in Figure 1, expression is the inside of side window airbag (not having expression among the figure) inflation vehicle 10 before. Vehicle 10 comprises front stall 12 and back seat 14, front window 16 and rear side window 18, and vehicle roof outline line 20 is kept at a hydrostatic column 22 that comprises side window airbag of the present invention (not having expression) in the vehicle roof outline line. Also have inflator element 24 in vehicle roof outline line 20, it is lighted gas and be advanced in the side window airbag (26 among Fig. 2) when crashing.
Side window airbag 26 after Fig. 2 represents to inflate. As mentioned above, airbag 26 every square metre of the coating agent (not shown) that is coated with at the most 84.78 grams, preferably polyurethane Merlon. Airbag 26 of the present invention will keep enough at least 5 seconds of inflated condition, and will be preferably more, most preferably reach at least 20 seconds.
Fig. 3 represents the unaerated state before side window airbag 26 is in being saved in the columniform container 22 of vehicle roof outline line. As mentioned above, the thickness of airbag 26, the ratio that is measured as the airbag degree of depth that the minimum point 28 from the hydrostatic column 22 of vehicle roof outline line to airbag 26 measures in packing diameter (as shown in following Fig. 5) and the state that is in after unaerated state or the inflation after winding up should be at least 17 and at the most 29.
Figure 4 and 5 help to understand situation about seeing when airbag 26 after winding up is saved in the container 22 of line 2. The diameter measurement result of the airbag 26 in the top example 3 is about 20 millimeters. The standard depth of side window airbag is about 17 inches or about 431.8 millimeters. Therefore, preferred packaging volume coefficient is about 21.6. By comparison, approximately the coating take silicones as the basis of the impost of every square metre 135.65 gram provides about 25 millimeters diameter for about 17.3 coefficient.
Certainly, in the design that is defined by the following claims or scope, can there be embodiment and the distortion of multiple change in the present invention.

Claims (41)

  1. One kind tumble the collision in the protection passenger the side window airbag cushion, described pad comprises fabric, wherein said fabric scribbles the artificial rubber complex, said artificial rubber complex comprises at least a 105kg/cm at least that has 2Tensile strength and greater than the artificial rubber of 180% elongation at break; The quantity of wherein said artificial rubber complex is every sq m fabric 84.78 grams at the most; And distinctive time of at least 5 seconds fallen the time after wherein said airbag cushion had inflation.
  2. 2. airbag cushion according to claim 1, wherein said artificial rubber complex is not contain silicone resin.
  3. 3. airbag cushion according to claim 1, wherein said artificial rubber complex composition comprises polyurethane.
  4. 4. airbag cushion according to claim 1, the fabric of wherein said coating forms by polyester yarn is woven.
  5. 5. airbag cushion according to claim 4, wherein said polyester yarn is made by 6,6 nylon fibers.
  6. 6. airbag cushion according to claim 4, wherein said polyester yarn is a polyfilament yarn, has the linear density at about 210-630 dawn.
  7. 7. airbag cushion according to claim 6, wherein said polyfilament yarn have about every 7 dawn of filament or thin silk thread density still less.
  8. 8. airbag cushion according to claim 1, wherein said artificial rubber complex occurs with the form of moisture or solvent-laden solution.
  9. 9. airbag cushion according to claim 3, wherein said artificial rubber polyurethane complex is the polycarbonate polyurethane.
  10. 10. airbag cushion according to claim 1, wherein said artificial rubber complex is present on the described air-bag fabric surface with the quantity of every sq m 67.82 grams at the most.
  11. 11. airbag cushion according to claim 10, wherein said artificial rubber complex is present on the described air-bag fabric with the quantity of every sq m 50.87 grams at the most.
  12. 12. airbag cushion according to claim 11, wherein said artificial rubber complex is present on the described air-bag fabric with the quantity of every sq m 40.69 grams at the most.
  13. 13. airbag cushion according to claim 12, wherein said artificial rubber complex is present on the described air-bag fabric with the quantity of every sq m 33.91 grams at the most.
  14. 14. airbag cushion according to claim 13, wherein said artificial rubber complex is present on the described air-bag fabric with the quantity of every sq m 27.13 grams at the most.
  15. 15. airbag cushion according to claim 1 has the packaging volume coefficient after about 17 to about 24 wind up.
  16. 16. airbag cushion according to claim 16, the packaging volume coefficient after wherein said the winding up approximately is 21.6.
  17. 17. an airbag cushion that comprises the fabric of coating, wherein said fabric is coated with the artificial rubber complex; Wherein said artificial rubber complex comprises at least 80% the material that does not contain silicone resin; And wherein said airbag cushion is before continuous ageing exposure and have distinctive time of at least 5 seconds after the inflation afterwards and fall the time.
  18. 18. airbag cushion according to claim 17, wherein said artificial rubber complex comprises at least a polyurethane.
  19. 19. airbag cushion according to claim 18, wherein said polyurethane complex is the polycarbonate polyurethane.
  20. 20. airbag cushion according to claim 17, wherein distinctive time between airbag before the burin-in process and the airbag after the burin-in process fallen the variation of time less than about 50%.
  21. 21. airbag cushion according to claim 17, the coating added weight of wherein said artificial rubber complex are every at the most sq m 84.78 grams.
  22. 22. airbag cushion according to claim 17, wherein said artificial rubber complex comprises at least a 105kg/cm of having 2The artificial rubber that does not contain silicone resin of tensile strength.
  23. 23. airbag cushion according to claim 17, wherein said airbag have 0.7 or littler coefficient of sliding resistance.
  24. 24. airbag cushion according to claim 17, wherein said airbag have the packaging volume coefficient after about 18.8 to about 29 wind up.
  25. 25. airbag cushion according to claim 17, wherein said fabric is coated with the artificial rubber complex; Wherein said artificial rubber complex comprises at least a 140kg/cm at least that has 2Tensile strength and the artificial rubber of at least 180% elongation at break; And distinctive time of at least 7 seconds fallen the time after wherein said airbag cushion had inflation.
  26. 26. airbag cushion according to claim 25, wherein said artificial rubber complex comprises polyurethane.
  27. 27. airbag cushion according to claim 25, the fabric of wherein said coating forms by polyester yarn is woven.
  28. 28. airbag cushion according to claim 27, wherein said polyester yarn is made by 6,6 nylon fibers.
  29. 29. airbag cushion according to claim 28, wherein said polyester yarn is a polyfilament yarn, has the linear density at about 210-630 dawn.
  30. 30. airbag cushion according to claim 29, wherein said polyfilament yarn have about every 7 dawn of filament or thin silk thread density still less.
  31. 31. airbag cushion according to claim 25, wherein said artificial rubber complex occurs with the form of latex.
  32. 32. airbag cushion according to claim 26, wherein said artificial rubber polyurethane complex is the polycarbonate polyurethane.
  33. 33. airbag cushion according to claim 25, wherein said artificial rubber complex is the polycarbonate polyurethane.
  34. 34. airbag cushion according to claim 25, wherein said artificial rubber complex is present on the described air-bag fabric surface with the quantity of every sq m 84.78 grams at the most.
  35. 35. airbag cushion according to claim 34, wherein said artificial rubber complex is present on the described air-bag fabric surface with the quantity of every sq m 67.82 grams at the most.
  36. 36. airbag cushion according to claim 35, wherein said artificial rubber complex is present on the described air-bag fabric with the quantity of every sq m 50.87 grams at the most.
  37. 37. airbag cushion according to claim 36, wherein said artificial rubber complex is present on the described air-bag fabric with the quantity of every sq m 40.69 grams at the most.
  38. 38. according to the described airbag cushion of claim 37, wherein said artificial rubber complex is present on the described air-bag fabric with the quantity of every sq m 33.91 grams at the most.
  39. 39. according to the described airbag cushion of claim 38, wherein said artificial rubber complex is present on the described air-bag fabric with the quantity of every sq m 27.13 grams at the most.
  40. 40. airbag cushion according to claim 25 has the packaging volume coefficient after about 17 to about 24 wind up.
  41. 41. according to the described airbag cushion of claim 40, the packaging volume coefficient after wherein said the winding up approximately is 21.6.
CNB008016992A 1999-06-17 2000-06-15 Low permeability airbag cushioos having extremely low coating levels Expired - Lifetime CN1173848C (en)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
US09/335,257 1999-06-17
US09/335,257 US6177365B1 (en) 1999-06-17 1999-06-17 Two-layered coating system for airbag fabrics
US09/350,620 1999-07-07
US09/350,620 US6177366B1 (en) 1999-06-17 1999-07-09 Two-layer coating system for airbag fabrics
US09/501,467 2000-02-09
US09/501,467 US7517570B1 (en) 1999-06-17 2000-02-09 Low permeability airbag cushions having extremely low coating levels

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CN1320089A CN1320089A (en) 2001-10-31
CN1173848C true CN1173848C (en) 2004-11-03

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CN (1) CN1173848C (en)
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JP4597447B2 (en) 2010-12-15
CA2340903A1 (en) 2000-12-28
EP1121276A4 (en) 2011-04-27
WO2000078577A1 (en) 2000-12-28
EP1121276A1 (en) 2001-08-08
AU5493200A (en) 2001-01-09

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