US4343680A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrophobic oleophilic wood pulp
Assignee: International Paper Co
•
Filing: 1981-03-06
•
Granted: 1982-08-10
•
Expires: 2001-03-06
Abstract
Abstract Treatment of high yield wood pulp which has ether extractives of greater than about 3.0% at temperatures of about 105° C. or higher for at least about 16 hours followed by fluffing of the heat treated pulp results in a relatively inexpensive absorbent for oil spills and the like. The oil is readily recovered from the absorbent or the oil and absorbent may be burned as fuel without separation.
Inventors
- 👤 Jasper H. Field
- 👤 Robert W. Hicks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:36
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/68; C02F1/681; C09; C09K; C09K3/00; C09K3/32; D; D21; D21C; D21C9/00; D21C9/001; D21C9/007; Y; Y10; Y10S; Y10S210/00; Y10S210/918; Y10S210/922; Y10S210/924
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
66 words
Hydrophobic, oleophilic pulp derived from high yield wood pulp by a process consisting essentially of: (a) treating high yield wood pulp having at least 3.0% ether extractive content at temperatures of greater than 100° C. for at least sufficient time until said pulp exhibits 30% or less water absorption when tested by Tappi test T491-Su 63; and (b) mechanically fluffing the pulp of step a above.
Claim 2
Dependent Claim
66 words
Hydrophobic, oleophilic pulp derived from high yield wood pulp by a process consisting essentially of: (a) treating high yield wood pulp having at least 3.0% ether extractive content at temperatures of greater than 100° C. for at least sufficient time until said pulp exhibits 30% or less water absorption when tested by Tappi test T491-Su 63; and (b) mechanically fluffing the pulp of step a above.
Claim 3
Dependent Claim
15 words
Pulp as defined in claim 1 wherein the wood pulp is derived from southern pine.
Claim 4
Dependent Claim
15 words
Pulp as defined in claims 1 or 2 wherein the wood pulp is thermomechanical pulp.
Claim 5
Dependent Claim
18 words
Pulp as defined in claims 1 or 2 wherein the wood pulp is heated at about 105° C.
Claim 6
Dependent Claim
16 words
Pulp as defined in claim 3 wherein the wood pulp is heated at about 105° C.
Claim 7
Dependent Claim
18 words
Pulp as defined in claim 1 or 2 wherein the wood pulp is heated for about 16 hours.
Claim 8
Dependent Claim
16 words
Pulp as defined in claim 3 wherein the wood pulp is heated for about 16 hours.
Claim 9
Dependent Claim
15 words
Pulp as defined in claim 4 wherein the wood pulp is heated about 16 hours.
Claim 10
Dependent Claim
16 words
Pulp as defined in claim 5 wherein the wood pulp is heated for about 16 hours.
Claim 11
Dependent Claim
69 words
A process for the preparation of hydrophobic, oleophilic wood pulp derived from high yield wood pulp which consists essentially of: (a) treating high yield wood pulp having at least 3.0% ether extractive content at temperatures of greater than 100° C. for at least sufficient time until said pulp exhibits 30% or less water absorption by Tappi Test T491-Su 673; and (b) mechanically fluffing the pulp of step a above.
Claim 12
Dependent Claim
69 words
A process for the preparation of hydrophobic, oleophilic wood pulp derived from high yield wood pulp which consists essentially of: (a) treating high yield wood pulp having at least 3.0% ether extractive content at temperatures of greater than 100° C. for at least sufficient time until said pulp exhibits 30% or less water absorption by Tappi Test T491-Su 673; and (b) mechanically fluffing the pulp of step a above.
Claim 13
Dependent Claim
75 words
A process for the removal of oil pollutants from at least a portion of the surface of a body of water which comprises dispersing a fluff pulp as described in claim 1 over at least a portion of the surface of a body of water, said portion of said surface being at least partly covered by oil pollutants, and thereafter removing the pulp with absorbed oil pollutants from the surface of the body of water.
References Cited (Backward Citations)
US3497418A
Cited
US3627630A
Cited
CA982951A
Cited
US3791990A
Cited
US3770575A
Cited
US4065347A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-08-09 | 1986-02-08 | 1986-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-08-09 | 1990-02-08 | 1990-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-08-09 | 1994-02-08 | 1994-08-10 | $7700.00 | Window Closed / Lapsed |