Title: Pressure sensitive adhesive material and method of preparation

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.

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Inventors: Walter, Brian W. (Bishop's Stortford, GB)

Application Number: 708775
Filing Date: 1976-07-26
Publication_date: 1979-08-07
Assignee: Smith & Nephew Research Limited (Harlow, GB2)
Primary Class(es): 428/317.3 156/77, 156/230, 156/246, 156/249, 156/332, 427/208.6, 427/245, 427/373, 427/379, 427/385.5, 428/343, 428/355AC, 523/111
Other Classes:
US Patent Ref:

2618580	Nov, 1952	Lancaster	156/77.
2940868	Jun, 1960	Patchell	428/343.
3090694	May, 1963	Pereny et al.	260/29.
3121021	Feb, 1964	Copeland	128/156.
3302501	Feb, 1967	Greene	28/DIG.
3484916	Dec, 1969	Johnstone	28/72.
3490937	Jan, 1970	Pietsch et al.	427/373.
3523846	Aug, 1970	Muller	428/355.
3565982	Feb, 1971	Day	428/304.
3719540	Mar, 1973	Hall	156/229.
3819542	Jun, 1974	Kreider	260/29.

Other Refs:
Primary Examiner: Goolkasian, John T.
Assistant Examiner: Gallagher, J. J.
Attorney: Beveridge, DeGrandi, Kline and Lunsford