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US 4,513,459 AGranted
Bleach cake in an improved bleach resistant particle retaining means
AssigneeThe Procter & Gamble Company
InventorElexsis D. Doughty
Life of this patent
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Abstract
An article of manufacture comprising a calcium hypochlorite cake composition in an improved particle retaining means which comprises a water-permeable polyvinyl chloride (PVC) bonded polyester (PET) filter sleeve which envelopes and supports the cake. The filter sleeve is designed to be rigid to avoid collapse in use, wicks water for improved cake contact, and is bleach resistant to insure a long product life.
Claims11
An article of manufacture comprising a solid cake of water-soluble calcium hypochlorite:
- CHARACTERIZED IN THAT:
- a nonwoven water-permeable envelope contains said solid cake, said envelope made of a heat sealable substrate comprising a polyester fiber bonded with a polyvinyl chloride polymeric latex binder (PVC), said substrate having a basis weight of from 30 to 55 g/m.sup.2, and a weight ratio of said PVC/Polyester of about 20:80 to about 60:40;
- said substrate having a minimum wet bending value of 3 mm.
Dependencies are inferred from the claim text.