US3887534A
Expired / Lapsed
US
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Method for producing a modified crystalline propylene polymer
Assignee: Sumitomo Chemical Co Ltd
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Filing: 1973-03-09
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Granted: 1975-06-03
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Expires: 1993-03-09
Abstract
Abstract A method for modification of crystalline propylene polymer which comprises heating a mixture comprising 100 parts by weight of said polymer and 0.001 to 0.5 part by weight of an aliphatic peroxide at a temperature of from 170* to 280*C to diminish the molecular weight of said polymer whereby its processability is much improved, said peroxide having a half life time of from 2.0 to 10.0 hours at 130*C and a vapor pressure of not more than 760 mmHg at 230*C.
Inventors
- 👤 Kazuo Baba
- 👤 Toshiaki Shiota
- 👤 Kikuo Murakami
- 👤 Kazuo Ono
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:34
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/14; C08F; C08F8/00; C08F8/50; C08F2810/00; C08F2810/10
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
68 words
A method for the modification of crystalline propylene polymer which comprises heating a mixture comprising 100 parts by weight of said polymer and 0.001 to 0.5 part by weight of an aliphatic peroxide at a temperature of from 170 to 280*C, said peroxide having a half life time of from 2.0 to 10.0 hours at 130*C and a vapor pressure of not more than 760 mmHg at 230*C.
Claim 2
Independent Claim
68 words
A method for the modification of crystalline propylene polymer which comprises heating a mixture comprising 100 parts by weight of said polymer and 0.001 to 0.5 part by weight of an aliphatic peroxide at a temperature of from 170 to 280*C, said peroxide having a half life time of from 2.0 to 10.0 hours at 130*C and a vapor pressure of not more than 760 mmHg at 230*C.
Claim 3
Independent Claim
68 words
A METHOD FOR THE MODIFICATION OF CRYSTALLINE PROPYLENE POLYMER WHICH COMPRISES HEATING A MIXTURE COMPRISING 100 PARTS BY WEIGHT OF SAID POLYMER AND 0.001 TO 0.5 PART BY WEIGHT OF AN ALIPHATIC PEROXIDE AT A TEMPERATURE OF FROM 170 TO 280*C, SAID PEROXIDE HAVING A HALF LIFE TIME OF FROM 2.0 TO 10.0 HOURS AT 130*C AND A VAPOR PRESSURE OF NOT MORE THAN 760 MMHG AT 230*C.
Claim 4
Independent Claim
68 words
A METHOD FOR THE MODIFICATION OF CRYSTALLINE PROPYLENE POLYMER WHICH COMPRISES HEATING A MIXTURE COMPRISING 100 PARTS BY WEIGHT OF SAID POLYMER AND 0.001 TO 0.5 PART BY WEIGHT OF AN ALIPHATIC PEROXIDE AT A TEMPERATURE OF FROM 170 TO 280*C, SAID PEROXIDE HAVING A HALF LIFE TIME OF FROM 2.0 TO 10.0 HOURS AT 130*C AND A VAPOR PRESSURE OF NOT MORE THAN 760 MMHG AT 230*C.
Claim 5
Dependent Claim
12 words
The method according to claim 1, wherein the aliphatic peroxide is 2,5-dimethyl-2,5-di-t-butylperoxyhexane.
Claim 6
Dependent Claim
12 words
The method according to claim 1, wherein the aliphatic peroxide is 2,5-dimethyl-2,5-di-t-butylperoxyhexyne-3.
Claim 7
Dependent Claim
67 words
In a method for the modification of crystalline propylene polymer by heating with an aliphatic peroxide at a temperature of from 170* to 280*C. to diminish the molecular weight and improve the processability thereof, the improvement which comprIses utilizing an aliphatic peroxide having a half life time of from 2.0 to 10.0 hours at 130*C. and a vapor pressure of not more than 760 mmHg at 230*C.
Claim 8
Dependent Claim
67 words
In a method for the modification of crystalline propylene polymer by heating with an aliphatic peroxide at a temperature of from 170* to 280*C. to diminish the molecular weight and improve the processability thereof, the improvement which comprIses utilizing an aliphatic peroxide having a half life time of from 2.0 to 10.0 hours at 130*C. and a vapor pressure of not more than 760 mmHg at 230*C.
Claim 9
Dependent Claim
12 words
The method according to claim 4, wherein the aliphatic peroxide is 2,5-dimethyl-2,5-di-t-butylperoxyhexane.
Claim 10
Dependent Claim
12 words
The method according to claim 4, wherein the aliphatic peroxide is 2,5-dimethyl-2,5-di-t-butylperoxyhexyne-3.
Claim 11
Dependent Claim
27 words
The method according to claim 4, wherein 0.001 to 0.5 part by weight of the aliphatic peroxide is used per 100 parts by weight of the polymer.
Claim 12
Dependent Claim
25 words
The method according to claim 1, wherein the polymer before heating has an intrinsic viscosity of 1.2 to 10.0 dl/g (determined in tetralin at 135*C).
Claim 13
Dependent Claim
25 words
The method according to claim 1, wherein the polymer after heating has an intrinsic viscosity of 0.7 to 3.0 dl/g (determined in tetralin at 135*C).
Claim 14
Dependent Claim
28 words
The method according to claim 1, wherein the heating is effected until the intrinsic viscosity of the polymer is decreased in the amount of 10 to 90 percent.
Claim 15
Dependent Claim
17 words
The method according to claim 1, wherein the heating is effected for 10 seconds to 5 minutes.
Claim 16
Dependent Claim
16 words
The method according to claim 1, wherein the heating is carried out in a melt extruder.
Claim 17
Dependent Claim
21 words
A modified crystalline propylene polymer having a diminished molecular weight and an improved processability, prepared by the method of claim 1.
Claim 18
Independent Claim
80 words
A method for the modification of crystalline propylene polymer in the absence of a solvent which comprises heating a mixture consisting essentially of 100 parts by weight of said polymer and 0.001 to 0.5 part by weight of an aliphatic peroxide in a melt extruder at a temperature of from 170* to 280*C., said peroxide having a half life time of from 2.0 to 10.0 hours at 130*C. and a vapor pressure of not more than 760 mmHg at 230*C.
Claim 19
Independent Claim
80 words
A method for the modification of crystalline propylene polymer in the absence of a solvent which comprises heating a mixture consisting essentially of 100 parts by weight of said polymer and 0.001 to 0.5 part by weight of an aliphatic peroxide in a melt extruder at a temperature of from 170* to 280*C., said peroxide having a half life time of from 2.0 to 10.0 hours at 130*C. and a vapor pressure of not more than 760 mmHg at 230*C.
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) | 1978-06-02 | 1978-12-02 | 1979-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-02 | 1982-12-02 | 1983-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-02 | 1986-12-02 | 1987-06-03 | $7700.00 | Window Closed / Lapsed |