Patent US3880803A successfully refreshed from Google Patents.
US3880803A
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Process for stabilizing polymers
Assignee: Stamicarbon BV
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Filing: 1972-12-11
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Granted: 1975-04-29
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Expires: 1992-12-11
Abstract
Abstract A process for stabilizing conventional particulate thermoplastic organic polymers by admixing conventional stabilizers for the polymers is disclosed, wherein the resulting polymer-stabilizing mixture is homogeneous and exhibits good polymer stability. The stabilizer has a melting point at least 1* C less than the temperature at which the polymer agglomerates and/or sinters and/or decomposes. The stabilizer is in the non-liquid state and preferably has a viscosity of at least 50 poise, measured under the conditions at which the stabilizer is added to the polymer. The polymer is heated to a temperature above the melting point of the stabilizer, and lower than the agglomeration and/or decomposition and/or sintering temperature of the polymer. The stabilizer is admixed with the polymer while the polymer is maintained at about the aforesaid temperature, and while the stabilizer is at a temperature at least about 1* C lower than the stabilizer melting point temperature. The mixing is preferably at a shear rate no greater than 1000 sec 1. The resulting polymers may be used in conventional applications for such polymers, and will exhibit improved stability against heat, light and/or oxygen.
Inventors
- 👤 Sietske Keizer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:06
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/20; C08J3/203
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
138 words
A PROCESS FOR STABILIZING AT LEAST ONE PARTICULATE THERMOPLASTIC ORGANIC POLYMER BY ADMIXING SAID PLYMER WITH AT LEAST ONE STABILIZER FOR STABILIZING SAID POLYMER AGAINST THE EFFECTS OF HEAT, LIGHT AND/OR OXYGEN, SAID STABILIZER HAVING A MELTING POINT AT LEAST 1*C LESS THAN THE TEMPERATURE AT WHICH THE POLYMER AGGLOMERATES, DECOMPOSES OR SINTERS, SAID STABILIZER BEING IN THE NON-LIQUID STATE, WHEREIN SAID POLYMER IS HEATED TO A TEMPERATURE AT LEAST 0.1* HIGHER THAN THE MELTING POINT OF SAID STABILIZER AND LOWER THAN THE AGGLOMERATION, DECOMPOSITION AND/OR SINTERING TEMPERATURE OF SAID POLYMER, AND THEREAFTER SAID POLYMER IS ADMIXED WITH FROM 0.001 TO 10% BY WEIGHT, BASED ON THE WEIGHT OF SAID POLYMER, OF SAID STABILIZER WHITE SAID POLYMR IS AT ABOUT SAID TEMPERATURE, AND WHILE SAID STABILIZER IS AT A TEMPERATURE AT LEST 1*C BELOW THE MELTING POINT THEREOF.
Claim 2
Dependent Claim
138 words
A PROCESS FOR STABILIZING AT LEAST ONE PARTICULATE THERMOPLASTIC ORGANIC POLYMER BY ADMIXING SAID PLYMER WITH AT LEAST ONE STABILIZER FOR STABILIZING SAID POLYMER AGAINST THE EFFECTS OF HEAT, LIGHT AND/OR OXYGEN, SAID STABILIZER HAVING A MELTING POINT AT LEAST 1*C LESS THAN THE TEMPERATURE AT WHICH THE POLYMER AGGLOMERATES, DECOMPOSES OR SINTERS, SAID STABILIZER BEING IN THE NON-LIQUID STATE, WHEREIN SAID POLYMER IS HEATED TO A TEMPERATURE AT LEAST 0.1* HIGHER THAN THE MELTING POINT OF SAID STABILIZER AND LOWER THAN THE AGGLOMERATION, DECOMPOSITION AND/OR SINTERING TEMPERATURE OF SAID POLYMER, AND THEREAFTER SAID POLYMER IS ADMIXED WITH FROM 0.001 TO 10% BY WEIGHT, BASED ON THE WEIGHT OF SAID POLYMER, OF SAID STABILIZER WHITE SAID POLYMR IS AT ABOUT SAID TEMPERATURE, AND WHILE SAID STABILIZER IS AT A TEMPERATURE AT LEST 1*C BELOW THE MELTING POINT THEREOF.
Claim 3
Dependent Claim
18 words
The process according to claim 1 wherein said stabilizer is admixed with said polymer in a fluidized bed.
Claim 4
Dependent Claim
18 words
The process according to claim 1, wherein said stabilizer is mixed with said polymer in a mixing drum.
Claim 5
Dependent Claim
20 words
The process according to claim 1, wherein the average smallest diameter of the polymer particles is less than 5 mm.
Claim 6
Dependent Claim
24 words
The process according to claim 1, wherein the polymer is in the form of fibers having a smallest dimension of less than 500 microns.
Claim 7
Dependent Claim
15 words
The process according to claim 1 wherein said thermoplastic organic polymer is one alkene polymer.
Claim 8
Dependent Claim
15 words
The process according to claim 1, wherein the thermoplastic organic polymer is a vinyl polymer.
Claim 9
Dependent Claim
19 words
The pRocess according to claim 1 wherein the polymer has a temperature of 20*-200*C when mixed with said stabilizer.
Claim 10
Dependent Claim
25 words
Process according to claim 1 wherein the polymer is heated to a temperature of at most 100*C higher than the melting point of said stabilizer.
Claim 11
Dependent Claim
25 words
Process according to claim 9 wherein the polymer is heated to a temperature between 5* and 60*C higher than the melting point of said stabilizer.
Claim 12
Dependent Claim
16 words
Process according to claim 1 wherein at most 5% by weight of said stabilizer is used.
Claim 13
Dependent Claim
9 words
Stabilized polymers produced by the process of claim 1.
Claim 14
Dependent Claim
45 words
Process according to claim 1, wherein said stabilizer is selected from the group consisting of substituted phenols and substituted bis phenols wherein the phenolic ring is substituted by at least one radical selected from the group consisting of hydroxyl and alkyl of 1-6 carbon atoms.
Claim 15
Dependent Claim
22 words
Process according to claim 1, wherein said stabilizer is a hydroxy compound containing from 3-6 carbon atoms and from 3-6 hydroxyl groups.
Claim 16
Dependent Claim
62 words
Process according to claim 1, wherein said stabilizer is selected from the group consisting of phenolic ethers and bis phenolic ethers wherein the phenolic ring can be substituted with a member selected from the group consisting of hydroxyl, alkyl of 1-6 carbon atoms and benzylradicals, which in turn may be substituted by hydroxyl, alkoxy groups and alkyl groups of 1-6 carbon atoms.
Claim 17
Dependent Claim
52 words
Process according to claim 1, wherein said stabilizer is a carboxylic acid ester of aliphatic and aromatic acids containing from 6 to 20 carbon atoms wherein the ester radical is alkyl of 4-20 carbon atoms or phenyl which may be substituted by at least one hydroxyl or alkyl of 1-12 carbon atoms.
Claim 18
Dependent Claim
52 words
Process according to claim 1, wherein said stabilizer is selected from the group consisting of aromatic keto compounds and diketo compounds wherein the carbonyl carbon atoms carries two aryl radicals which may be substituted by at least one hydroxyl, halogen, carboxyl, alkyl of 1-6 carbon atoms or alkoxy of 1-10 carbon atoms.
Claim 19
Dependent Claim
49 words
Process according to claim 1, wherein said stabilizer is selected from the group consisting of aromatic secondary amines and diamines containing at least one phenyl or naphthyl substituent and at least one other nitrogen substitutent selected from the group consisting of phenyl, naphthyl and alkyl of 1-10 carbon atoms.
Claim 20
Dependent Claim
27 words
Process according to claim 1, wherein said stabilizer is an aryl phosphite, wherein the aryl ring may be substituted with hydroxyl or alkyl of 1-12 carbon atoms.
Claim 21
Dependent Claim
61 words
Process according to claim 1, wherein said stabilizer is selected from the group consisting of aromatic and aliphatic thio ethers and mercapto compounds, wherein the sulphur atom(s) carries at least one substituent selected from the group consisting of phenyl, substituted phenyl having at least one hydroxyl substituent or alkyl substituent of 1-6 carbon atoms, propionate, and alkyl of 1-20 carbon atoms.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-28 | 1978-10-28 | 1979-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-28 | 1982-10-28 | 1983-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-28 | 1986-10-28 | 1987-04-29 | $7700.00 | Window Closed / Lapsed |