Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Patent
1986-06-11
1989-03-07
Schofer, Joseph L.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
524548, 526273, C08J 3900
Patent
active
048107514
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to thermally self-crosslinkable emulsion copolymers which may be used as binders, impregnants and/or coatings on textile substrates and in other textile treatments.
Emulsion polymers useful in the aforementioned applications have become a well known article of commerce and are based on such well known monomers as the acrylic esters, butadiene, styrene, vinyl acetate or vinyl chloride. The utility of crosslinkable polymers normally applies to those areas which require durability to repeated washing and drycleaning, and stability to prolonged exposure to heat and light. It is also possible to manufacture emulsion polymers in a wide range of flexibilities which can be tailored to suit particular applications. Some important applications where the highest standards of performance are routinely demanded of emulsion polymers include binders for nonwoven fabrics, adhesives for flocking and laminating of textile, coatings for fabrics and as binders for the pigment printing of textiles. Aqueous emulsions of such polymers are required to become substantially durable as binders, impregnants or coatings when dried and crosslinked with or without additional heat treatment on the textile substrate.
According to one aspect of the present invention there is provided an aqueous emulsion of a thermally self-crosslinkable copolymer having a molecular weight in the range 50,000 to 10,000,000, a second order of transition temperature (Tg) in the range -40.degree. C. to +30.degree. C. and useful as a binder, impregnant and/or coating for textiles comprising methacryalmide, compatible monoethylenically unsaturated monomer.
According to another aspect of the present invention there is provided an aqueous emulsion of a thermally self-crosslinkable copolymer having a molecular weight in the range 50,000 to 10,000,000, a second order of transition temperature (Tg) in the range -40.degree. C. to +30.degree. C. and useful as a binder, impregnant and/or coating for textile comprising methacrylamide, methyl methacrylate, butyl acrylate, propyl acrylate or 2-ethylhexyl acrylate.
The copolymers may be prepared in a conventional manner by emulsion polymerisation of the monomers. The aqueous emulsion contains from 30 to 65%, preferably from 40 to 55% by weight of the said copolymers.
It has been surprisingly found that a synergistic effect is obtained by the particular combination of functional monomers (i.e. those monomers having reactive groups expected to participate in crosslinking reactions), namely components (a), (b) and (c) when incorporated into a polymer backbone, such as for example in one form of the invention comprising components (d), (e) and (f). The surprising observation was that this effect is not obtained when any of the components (a), (b) or (c) is omitted or when alternative conventional backbone compositions are employed, such as those backbones not containing component (d) and optionally containing components (e) and (f).
According to another aspect of the present invention there is provided an aqueous emulsion of a thermally self-crosslinkable copolymer having a molecular weight in the range 50,000 to 10,000,000, a second order transition temperature in the range -20.degree. C. to +30.degree. C., and being useful as a binder, impregnant and/or coating for textiles comprising methacrylamide, other compatible monomers.
A typical polymer backbone of this form of the invention comprises ethyl acrylate, about 10% by weight methyl acrylate, and the remainder being methyl methacrylate.
In a still further embodiment of this invention there is provided an aqueous emulsion of a thermally self-crosslinkable copolymer having a molecular weight in the range 50,000 to 10,000,000, a second order transition temperature in the range -40.degree. C. to -15.degree. C., and being useful as a binder, impregnant and/or coating for textiles comprising
A typical polymer backbone of this form of the invention would comprise ethyl acrylate and butyl acrylate in amounts depending on the desired T.sub.g required.
A
REFERENCES:
patent: 3242123 (1966-03-01), Mayfield et al.
patent: 3336149 (1967-08-01), Fox et al.
patent: 3350339 (1967-10-01), Sekmakas
patent: 3729338 (1973-04-01), Lehmann et al.
patent: 3810859 (1974-05-01), Mikofalvy
patent: 4623679 (1986-11-01), Gimpel et al.
Bain Gregory C.
Jellinek Thomas
Commonwealth Scientific and Industrial Research Organization
Reddick J. M.
Schofer Joseph L.
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