Hydrophobic biodegradable cellulose containing composite materials
AssigneeRademate Ltd.
InventorsMichael Ioelovich, Oleg Figovsky
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Abstract
Composite cellulose containing materials which are waterproof and biodegradable are produced which consist essentially of cellulose and hydrophobic polymer-based composition in the amount about 4 to 40 wt %. The polymer-based composition comprises first polymer, which is partially saponified polyvinyl acetate, second polymer, which functions as plasticizer for improving elasticity of the first polymer and cross-linking agent, which is capable to cross-link the first polymer. The polymer-based composition may additionally contain environmentally friendly hydrophobizators, fillers and pigments.
Claims20
A composite material comprising a cellulose component and a polymer-based component, wherein said polymer-based component is formed using a mixture of:
- a) a first polymer comprising polyvinyl acetate latex which contains 2-8 wt. % free hydroxyl groups;
- b) a second polymer comprising a non cross-linked latex selected from the group consisting of poly-(C2-C4)-alkylacrylates, copolymers of vinyl with (C2-C4)-alkylacrylate and -copolymers of (C2-C4)-alkylacrylate with (C2-C4)-alkylmethacrylate, said second polymer providing improved elasticity to the first polymer upon adding the second polymer thereto;
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- d) a cross-linking agent.
An article of manufacture made of a composite material comprising a cellulose containing component and a polymer-based component, wherein said polymer based component is formed from a mixture of:
- a) a first polymer, said first polymer being cross-linked, said first polymer being a product of partial saponification of polyvinyl acetate latex carried out at pH 10-12, 30-35 degrees C. for 20-35 min, and said first polymer contains 2-8 wt. % of free hydroxyl groups;
- b) a second polymer, said second polymer being a non cross-linked latex, said second polymer is selected from the group consisting of poly-(C2-C4)-alkylacrylates, co-polymers of vinyl with (C2-C4)-alkylacrylate and co-polymers of (C2-C4)-alkylacrylate with (C2-C4)-alkylmethacrylate and said second polymer being capable to impart improved elasticity to the first polymer upon adding the second polymer thereto;
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- c) a cross-linking agent capable to effect cross-linking of the first polymer, said cross-linking agent contains at least two functional groups, and said functional groups being hydroxyl, carboxyl, amine or aldehyde groups.
Dependencies are inferred from the claim text.