The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 07, 1979
Filed:
Jul. 26, 1976
Brian W Walter, Bishop's Stortford, GB;
Smith & Nephew Research Limited, Harlow, GB;
Abstract
The present invention provides a process for making a water vapor permeable pressure sensitive adhesive material which comprises forming on a surface which is poorly wettable (or non-wettable) by water, a continuous coating of an aqueous emulsion based pressure sensitive adhesive having dispersed therein a water immiscible organic liquid which is more volatile than water and which does not break the emulsion; leaving the coating at room temperature until pores develop and reach a size such that the material when dried will have a water vapor permeability of from 2000 to 10,000 units as hereinafter defined; drying the coating at a higher temperature and transferring the adhesive mass to a water vapor permeable backing material. The pressure sensitive adhesive material finds use in the medical and surgical fields and especially in first-aid dressings and tapes.