Stock material or miscellaneous articles – Hollow or container type article – Polymer or resin containing
Reexamination Certificate
1998-07-23
2001-03-20
Kiliman, Leszek (Department: 1773)
Stock material or miscellaneous articles
Hollow or container type article
Polymer or resin containing
C428S315500, C428S474400, C428S480000, C528S070000, C528S272000, C528S288000, C528S297000, C528S292000, C528S310000, C528S323000, C528S328000, C528S326000, C524S104000, C524S505000, C524S608000, C525S408000, C525S423000, C525S430000, C525S437000
Reexamination Certificate
active
06203872
ABSTRACT:
The invention pertains to a process for sealing the seams of a water vapour permeable lining comprising a laminate of a textile material and a waterproof, but water vapour permeable film in which sections of said laminate with the textile sides facing each other are bonded together following the contours of the material to be lined.
Such a process is known from EP-A-410 291. According to the process described in said document, first a laminate is produced by bonding a textile material and a water vapour permeable film together using a waterproof, but water vapour permeable adhesive applied across the entire surface area, after which sections of this laminate with the textile sides facing each other are heated following the contours of the material to be lined, so that the adhesive will melt in situ and/or is activated, and after cooling a lining with wholly waterproof seams is obtained.
A drawback to the process described in this document is that a thermoplastic polyetherurethane is selected as the adhesive. A significant disadvantage of polyurethanes is constituted by the high toxicity of the polyisocyanates employed in their preparation and the long periods required for the adhesive to complete its reaction process.
The Invention now provides a process which obviates the drawback to the known process wholly or for the most part.
The invention consists in that in a process of the known type mentioned in the opening paragraph the lining is dipped in a solution of a hydrophilic polymer in an organic solvent which acts as a swelling agent for the waterproof film of the laminate, followed by evaporation of the solvent.
A major advantage achieved when using the process according to the invention is that the lining is ready for use immediately after evaporation of the solvent and can be processed without delay.
It is not necessary to treat the entire lining with a solution of a hydrophilic polymer. Preferably, only the section of the lining with the waterproof film turned inside out where the seams are is subjected to a dipping treatment.
The linings of which the seams can be waterproofed by the process according to the invention are used not only in the textile industry but also in the furniture and car industries. However, the advantages are especially evident in the case of use in the clothing industry in the manufacture of waterproof, but water vapour permeable gloves, garments or shoes.
It has been found that, as a rule, very favourable results are obtained when
a) for the water vapour permeable, but waterproof film in the laminate use is made of a copolyetherester consisting of a plurality of recurrent intralinear long-chain ester units and short-chain ester units randomly joined head to tail through ester bonds, the long-chain ester units corresponding to the formula
and the short-chain ester units corresponding to the formula:
wherein G is a divalent radical remaining after the removal of terminal hydroxyl groups from at least one long-chain glycol having an average molecular weight in the range of 600 to 4000 and an atomic ratio of carbon to oxygen in the range of 2.0 to 4.3, at least 20 wt %. of the long-chain glycol having a carbon to oxygen ratio in the range of 2.0 to 2.4, and 15 to 50 wt %. being part of the copolyetherester, R is a divalent radical remaining after the removal of carboxyl groups from at least one dicarboxylic acid having a molecular weight of less than 300, and D is a divalent radical remaining after the removal of hydroxyl groups from at least one diol having a molecular weight of less than 250, with at least 70 mole % of the dicarboxylic acid employed being either terephthalic acid or 2,6-naphthalene dicarboxylic acid or its ester forming equivalents and at least 70 mole % of the low-molecular weight diol consisting of 1,4-butane diol or its ester forming equivalents, with the sum of the mole percentage of dicarboxylic acid which is neither terephthalic acid nor 2,6-naphthalene dicarboxylic acid or its ester forming equivalents and the mole percentage of low-molecular weight dial which is not 1,4-butane diol or its ester forming equivalents being not more than 30, and the short-chain ester units making up 25-75 wt %. of the copolyetherester,
b) the hydrophilic polymer which after evaporation of the solvent forms a waterproof, but water vapour permeable coating is made up of a copolyetherester of a similar type and composition as listed under a), with the proviso that preference is given to a polymer of which the melting point is at least 5° C. and at most 35° C. lower than that of the copolyetherester of which the waterproof film in the laminate is made, and
c) the organic solvent is selected from the group of halogenated hydrocarbons.
Copolyetheresters with a reduced melting point can be obtained, int. al., by the incorporation into the short-chain ester units of a dicarboxylic acid other than terephthatic acid or naphthalene dicarboxylic acid having a molecular weight of less than 300 or some other dial having a molecular weight of less than 250. Examples of dicarboxylic acids suitable for use are isophthalic acid and adipic acid. As an example of an alternative low-molecular weight diol to 1,4-butane diol may be mentioned ethylene glycol.
The halogenated solvents which are preferred according to the present invention can contain fluorine as well as chlorine, bromine or iodine. Since preference is given to solvents with a low boiling point, fluorine- and chlorine-containing solvents are especially eligible for use.
So far, optimum results have been obtained with the organic solvent used being a chlorinated organic solvent belonging to the group of methylene chloride, chloroform, dichloroethane, trichloroethane, and tetrachloroethane.
Examples of copolyetheresters suitable for use according to the present invention have been described, int. al., in U.S. Pat. No. 4,493,870 and U.S. Pat. No. 5,562,977.
Favourable results can also be obtained when the water vapour permeable, but waterproof film in the laminate is formed by a copolyetheramide composed of polyamide segments A and ethylene oxide groups-containing polyamide segments B, with the polyamide segments A comprising monomer units of the structure:
wherein R
1
stands for an alkylene group having 3 to 11 carbon atoms which may be substituted or not and R
2
and R
3
may be the same or different and stand for a (cyclo)alkylene group having 4 to 11 carbon atoms which may be substituted or not or a difunctional aromatic group, and the polyamide segments B comprising monomer units of the structure:
wherein G stands for a divalent group remaining after the removal of the amino terminated groups of a polyoxyalkylene diamine which is connected or not via one or more lactam units included among the polyamide segments A according to the former formula with a dicarboxylic acid unit wherein R
4
has the meaning of a (cyclo)alkylene group which may be substituted or not, a polyoxyalkylene group or a difunctional aromatic group, with
&agr;) at least 10 and at most 30 wt %. of the copolyetheramide being made up of ethylene oxide groups,
&bgr;) 30 to 60 wt %. of the copolyetheramide being made up of polyamide segments A and 70 to 40 wt %. being made up of polyamide segments B containing the monomer units according to formula (III), wherein G stands for a polyoxyalkylene group having a molecular weight of 600 to 6000 and an atomic ratio of carbon to oxygen of 2.0 to 4.3, or when the group R
4
stands for a divalent group obtained after removal of the carboxyl groups, for a dimeric fatty acid or for a polyoxyalkylene group having a molecular weight of 600 to 6000 and an atomic ratio of carbon to oxygen of 2.0 to 4.3, as well as for a (cyclo)alkylene group having 2 to 12 carbon atoms which may be substituted or not or for a difunctional aromatic group, and
&ggr;) the copolyetheramide having a melting point in the range of 180 to 260° C.
Examples of copolyetheramides suitable for use according to the present invention have been described, int. al., in U.S. Pat. No. 5,744,570.
When a copolyetheramide film is us
Akzo Nobel nv
Kiliman Leszek
Oliff & Berridg,e PLC
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