US4046734A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the manufacture of aminoplast and phenoplast moulding compositions using a thin layer evaporator or a roller drier
Assignee: Novartis Corp
•
Filing: 1974-11-05
•
Granted: 1977-09-06
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Expires: 1994-11-05
Abstract
Abstract Aminoplast or phenoplast compositions are manufactured by drying an aqueous solution of a phenol-formaldehyde resin, a urea-formaldehyde resin or an optionally phenol-modified melamine-formaldehyde resin in a thin layer evaporator or roller drier. The compositions are used for the manufacture of crockery, household articles and technical components for the electrical industry.
Inventors
- 👤 Willi Zimmerli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:26
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/20; C08J3/205; C08J3/21; C08J3/212; C08J3/12; C08J2361/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
95 words
An improved process for the manufacture of aminoplast or phenoplast compositions by drying an aqueous solution, which optionally contains pigments or mineral fillers, of a phenol-formaldehyde resin, a urea-formaldehyde resin, a melamine-formaldehyde resin or a phenol-modified melamine-formaldehyde resin, grinding the resin composition, optionally mixing it with a filler, pigment, lubricant and, if desired, other additives, and warm-densifying the mixture wherein the improvement comprises passing the aqueous resin solution into a thin layer evaporator or roller drier, distilling off the water at an elevated temperature, and withdrawing the dried material in a fused or solid form.
Claim 2
Dependent Claim
95 words
An improved process for the manufacture of aminoplast or phenoplast compositions by drying an aqueous solution, which optionally contains pigments or mineral fillers, of a phenol-formaldehyde resin, a urea-formaldehyde resin, a melamine-formaldehyde resin or a phenol-modified melamine-formaldehyde resin, grinding the resin composition, optionally mixing it with a filler, pigment, lubricant and, if desired, other additives, and warm-densifying the mixture wherein the improvement comprises passing the aqueous resin solution into a thin layer evaporator or roller drier, distilling off the water at an elevated temperature, and withdrawing the dried material in a fused or solid form.
Claim 3
Dependent Claim
22 words
A process according to claim 1 wherein the dried material in a fused or solid form comprises from 92 to 97% resin.
Claim 4
Dependent Claim
26 words
A process according to claim 1, characterised in that the thin layer evaporator or the roller drier is at a temperature of 150° - 220° C.
Claim 5
Dependent Claim
30 words
A process according to claim 1, characterised in that an aqueous solution with a resin content of about 50% is passed into the thin layer evaporator or the roller drier.
Claim 6
Dependent Claim
24 words
A process according to claim 1, characterised in that mineral fillers are admixed to the resin solution and the mixture is dried and ground.
Claim 7
Dependent Claim
16 words
A process according to claim 1, characterised in that the warm-densified mixture is cooled and ground.
References Cited (Backward Citations)
US2101635A
Cited
US2810700A
Cited
US3398012A
Cited
US3376239A
Cited
GB1227493A
Cited
US3759687A
Cited
US3793302A
Cited
US3786041A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-09-05 | 1981-03-07 | 1981-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-05 | 1985-03-07 | 1985-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-05 | 1989-03-07 | 1989-09-06 | $7700.00 | Window Closed / Lapsed |