Stock material or miscellaneous articles – Pile or nap type surface or component – Particular backing structure or composition
Patent
1981-06-25
1982-09-21
Bell, James J.
Stock material or miscellaneous articles
Pile or nap type surface or component
Particular backing structure or composition
428253, 428254, 428257, 428266, 4284231, 4284237, 428447, B32B 302, B32B 3300
Patent
active
043507255
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to circular weft-knit or circular warp-knit polyurethane-coated stretch fabrics made from synthetic filament yarn, especially polyester yar, and garments made therefrom.
2. Description of Prior Art
Elastic, polyurethane-coated interlock circular knitted goods of this type made from polyester have been disclosed, for example, in French Published Patent Application No. 22 16 111. Although these goods are elastic by reason of the elasticity of the mesh, their great resistance to deformation makes them for the most part unsuitable for many applications and in particular they are not suitable for garments which are worn next to the body and fit closely during movement of the body.
SUMMARY OF THE INVENTION
It has been discovered that polyurethane-coated circular weft-knit or circular warp-knit goods made from synthetic yarn, especially polyester filament yarn, have an especially low resistance to deformation when the circular weft-knit or circular warp-knit goods are made of textured continuous filament yarn and are provided with a polysiloxane elastomer finish. The resistance to deformation, as compared with uncoated goods, is decreased in the ratio of 1:1.1 to 1:5, preferably 1:1.5 to 1:3.5, for extensions ranging up to 70% of the breaking elongation with an elastic recovery of 85% of the extension applied during use.
DETAILED DESCRIPTION OF THE INVENTION AND PREFERRED EMBODIMENTS
The yarns can be made of the same or different fiber materials, using untwisted, twisted or plied continuous filaments. The yarns may be pure white, matted, dyed, or spun-dyed. The circular weft-knit or circular warp-knit fabric may also be treated by the dying or printing methods conventionally used in the textile industry.
Suitable materials which are useful for preparing the fabrics are interlock circular knit materials. For garments which are worn in contact with the body, circular weft-knit or circular warp-knit pile fabrics have proved suitable. In this case other yarns, for example cotton yarn, can be used for the pile loops.
The polysiloxane elastomer finish may be applied by a known process in which organopolysiloxanes, including alky-, phenyl-, and dialkylpolysiloxanes, as well as hydroxy- and alkylhydrosiloxanes, in this case particularly polymethylhydrosiloxanes, in aqueous emulsion or preferably in perchloroethylene, are applied to the fibers of the knitted fabric and are cross-linked thereon. This treatment, together with the use of textured yarns, produces very great elasticity in the knitted fabric, as described in German Offenlegungsschrift No. 17 94 170 and Japanese Published patent application No. 72/23717. This elasticity is not decreased by the polyurethane coating. Moreover, compared with the uncoated material, the polyurethane-coated material surprisingly shows a significant reduction in its resistance to deformation.
The silicone elastomer finish may be applied on both sides of the material, but is preferably applied only on the side which is not to be coated with polyurethane.
The polyurethane coating can be applied in the usual way by applying a urethane prepolymer to the circular weft-knit or circular warp-knit fabric and then carrying out further curing. Application of the polyurethane coating by the so-called reverse method has proved particularly satisfactory. Suitable prepolymers include standard commercial mixtures based on hydroxypolyesters, hydroxypolyethers or polyhydroxypolyesterurethanes and polyisocyanates.
The polyurethane may be dyed in a conventional manner, and the dyes used may also include fluorescent dyes. The polyurethane may also be colorless and exhibit the color of the underlying circular weft-knit or circular warp-knit fabric. The polyurethane coating may also be grained in a conventional manner.
The elastic polyurethane-coated circular weft-knit or circular warp-knit fabric may be prepared, for example, by the following process steps;
knitting the circular weft-knit or circular warp-knit fabric,
washi
REFERENCES:
patent: 3255068 (1966-06-01), Smith
patent: 3481821 (1969-12-01), Brunner et al.
patent: 3637427 (1972-01-01), Tsuruta et al.
patent: 3926700 (1975-12-01), Hopkins et al.
patent: 3948722 (1976-04-01), Wheeldon et al.
patent: 4172165 (1979-10-01), Kuckhefer et al.
patent: 4228194 (1980-10-01), Meeder
patent: 4233358 (1980-11-01), Jones et al.
Bell James J.
Norddeutsche Faserwerke GMBH
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