| 摘要 |
1,190,619. Insulating labels. DOW CHEMICAL CO. 11 July, 1967 [18 July, 1966], No. 31926/67. Heading B8F. [Also in Division B2] An insulating label, for example, for application to containers for holding hot food, has a layer of closely spaced hollow resinous bodies joined by synthetic resin, adhered to a pliable sheet. The insulating layer may extend over the whole area of the label, or only over restricted areas, for example as shown at 45. The label may be secured by pressure-sensitive or other adhesive. The outer sheet may be of paper or plastics film. The inner insulating layer may comprise hollow microspheres of a styrene-acrylonitrile polymer adhered together by an aqueous resinous dispersion prepared by copolymerizng methylmethacrylate, ethyl acrylate and acrylic acid. The microspheres are formed to occlude neopentane which serves as a blowing agent when the layer is cured after being coated on the outer sheet. Alternatively the spheres may be copolymers of vinylidene chloride and acrylonitrile containing 1,2-diohlorotetrafluorethylene. Alternatively phenolformaldehyde and urea-formaldehyde microspheres may be bound by a nitrocellulose lacquer. Other suitable binders are a solution of rubber in toluene or a copolymer of styrene and butadiene.
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