Patent US3948675A successfully refreshed from Google Patents.
US3948675A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of particulate plasticised nitrocellulose
Assignee: Societe Nationale des Poudres et Explosifs
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Filing: 1973-07-30
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Granted: 1976-04-06
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Expires: 1993-07-30
Abstract
Abstract A process for the production of plasticised nitrocellulose in the form designated "semi-chips", comprises impregnating nitrocellulose flock while the latter is present in a stirred suspension in water, separating the plasticised nitrocellulose obtained from the suspension, and drying at a temperature not exceeding 60° C. The novel nitrocellulose "semi-chips" and the novel apparatus to carry out the invention are also described.
Inventors
- 👤 Roger Maurice Rat
- 👤 Francois Ange Pollozec
- 👤 Jacques Plazanet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:54
CPC Classifications
C; C08; C08L; C08L1/00; C08L1/08; C08L1/16; C08L1/18
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
66 words
A process for the production of particulate plasticised nitrocellulose, which comprises the steps of: i. forming a suspension of nitrocellulose flock in water, ii. adding a gelatinising plasticiser to said suspension while stirring the latter, whereby said nitrocellulose becomes impregnated with said plasticiser, iii. separating the plasticised nitrocellulose obtained from the suspension, and iv. drying the separated plasticised nitrocellulose at a temperature of up to 60°C.
Claim 2
Dependent Claim
66 words
A process for the production of particulate plasticised nitrocellulose, which comprises the steps of: i. forming a suspension of nitrocellulose flock in water, ii. adding a gelatinising plasticiser to said suspension while stirring the latter, whereby said nitrocellulose becomes impregnated with said plasticiser, iii. separating the plasticised nitrocellulose obtained from the suspension, and iv. drying the separated plasticised nitrocellulose at a temperature of up to 60°C.
Claim 3
Dependent Claim
21 words
A process according to claim 1, wherein said plasticiser is selected from the group consisting of dibutyl phthalate and dioctyl phthalate.
Claim 4
Dependent Claim
20 words
A process according to claim 1 wherein the plasticiser is used in admixture with a gelatinising solvent of the nitrocellulose.
Claim 5
Dependent Claim
27 words
A process according to claim 1, wherein the amount of said plasticiser is from about 10 % to about 30 % by weight based on said nitrocellulose.
Claim 6
Dependent Claim
19 words
A process according to claim 1, wherein step (ii) is carried out for about 5 to about 6 hours.
Claim 7
Dependent Claim
25 words
A process according to claim 1, wherein the suspension is maintained at a temperature of from about 40° to about 50° C during step (ii).
Claim 8
Dependent Claim
37 words
A process according to claim 1, wherein in step (iii) the separated nitrocellulose is drained to a moisture content of about 40 % and in step (iv) is dried to a mixture content of about 1 %.
Claim 9
Dependent Claim
13 words
The particulate plasticised nitrocellulose obtained by the process set forth in claim 1.
Claim 10
Dependent Claim
59 words
Plasticised nitrocellulose in the form of semi-chips with an apparent specific gravity of from about 0.13 to about 0.34 and consisting of nitrocellulose fibers gelatinized by a plasticiser and agglomerated into friable grains capable of passing through a 3 mm mesh sieve, which are free of any residual solvent, free of protective colloids and do not contain fine dust.
Claim 11
Dependent Claim
59 words
Plasticised nitrocellulose in the form of semi-chips with an apparent specific gravity of from about 0.13 to about 0.34 and consisting of nitrocellulose fibers gelatinized by a plasticiser and agglomerated into friable grains capable of passing through a 3 mm mesh sieve, which are free of any residual solvent, free of protective colloids and do not contain fine dust.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-04-06 | 1979-10-06 | 1980-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-04-06 | 1983-10-06 | 1984-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-04-06 | 1987-10-06 | 1988-04-06 | $7700.00 | Window Closed / Lapsed |