US3919355A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for preparing shock-resistant grafted copolymers of styrene or vinyltoluene with synthetic rubber
Assignee: Individual
•
Filing: 1974-08-15
•
Granted: 1975-11-11
•
Expires: 1994-08-15
Abstract
Abstract The method for preparing shock-resistant grafted copolymers of styrene or vinyltoluene with synthetic rubber consists in dissolution of synthetic rubber in styrene or vinyltoluene at a temperature of 20* to 80*C with subsequent heating of the obtained solution at a temperature 85-125*C in the presence of a plasticizer and a regulator of molecular weight till the conversion of the starting styrene or vinyltoluene is 25-40 per cent with the formation of pre-polymer, which undergoes suspension-polymerization by heating in an aqueous medium to a temperature not above 140*C at the ratio of the pre-polymer to water of 5:3 to 10:3, respectively in the presence of initiators of polymerization and a stabilizing system, consisting of 0.151.5 per cent by weight of tricalcium phosphate, 0.003-0.02 per cent by weight of a mixture of sodium salts of secondary alkylsulphates, having the general formula R-OSO3Na, where R is a hydrocarbon radical having from 8 to 18 carbon atoms, and 0.150.35 per cent by weight of calcium carbonate, which is introduced into the suspension-polymerization process at a temperature not above 90*C.
Inventors
- 👤 Galina Dmitrievna Ballova
- 👤 Ekaterina Ivanovna Egorova
- 👤 Klavdiya Andreevna Sivograkova
- 👤 Georgy Lazarevich Bezborodko
- 👤 Mariya Moiseevna Lebedeva
- 👤 Irina Ivanovna Rusinovskaya
- 👤 Larisa Fedorovna Maladzyanova
- 👤 Vladimir Nikolaevich Maximov
- 👤 Tamara Nikolaevna Ostrovskaya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 10:45
CPC Classifications
C; C08; C08F; C08F279/00; C08F279/02
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
166 words
A METHOD FOR PREPARING SHOK-RESISTANT GRAFTED COPOLYMRS OF STYRENE WITH SYNTHETIC RUBBER, CONSISTING IN THAT RUBBER DISSOLVED IN STYRENE AT A TEMPERATURE OF 20* TO 80*C, THE OBTAINED SOLUTION IS HEATED AT A TEMPEATURE OF 85*-125*C IN THE PRESENCE OF PLASTICIZER AND A REGULAR OF MOLECULAR WEIGHT UNTIL THE CONVERSION OF STYENE IS 2-40 PER CENT WITH FORMATION F PER-POLYMER UNDERGOES SUSPENSION-POLYMERIZATION BY HEATING IN AN AQUEOUS MEDIUM TO THE TEMPERATURE NOT ABOVE 140*C AT THE RATIO OF THE PRE-POLYMER OT WATER OF 5:3 TO 10:3 RESPECTIVELY IN THE PRESENCE OF THE POLYMERIZATION UNITIATORS AND A STABILIZING SYSTEM, CONSISTING OF 0.15 - 1.5 PE CENT BY WEIGHT OF TRICALIUM PHOSPHATE, 0.003 - 0.02 PER CENT BY WEIGHT OF A MIXTURE OF SODIUM SALTS OF SECONDARY ALKYLSULPHATES HAVING THE GENERAL FORMULA R-OSO3NA, WHERE R IS A HYDROCARBON RADICAL, CONTAINING FROM 8 TO 1, CARBON ATOMS, AND 0.15-0.35 PERCENT BY WEIGHT OF CALCIUM CARBONATE, WHICH IS INTRODUCED INTO HEPROCESS OF SUSPENSION POLYMERIZATION AT A TEMPERATUE NOT ABOVE 90*C.
Claim 2
Independent Claim
166 words
A METHOD FOR PREPARING SHOK-RESISTANT GRAFTED COPOLYMRS OF STYRENE WITH SYNTHETIC RUBBER, CONSISTING IN THAT RUBBER DISSOLVED IN STYRENE AT A TEMPERATURE OF 20* TO 80*C, THE OBTAINED SOLUTION IS HEATED AT A TEMPEATURE OF 85*-125*C IN THE PRESENCE OF PLASTICIZER AND A REGULAR OF MOLECULAR WEIGHT UNTIL THE CONVERSION OF STYENE IS 2-40 PER CENT WITH FORMATION F PER-POLYMER UNDERGOES SUSPENSION-POLYMERIZATION BY HEATING IN AN AQUEOUS MEDIUM TO THE TEMPERATURE NOT ABOVE 140*C AT THE RATIO OF THE PRE-POLYMER OT WATER OF 5:3 TO 10:3 RESPECTIVELY IN THE PRESENCE OF THE POLYMERIZATION UNITIATORS AND A STABILIZING SYSTEM, CONSISTING OF 0.15 - 1.5 PE CENT BY WEIGHT OF TRICALIUM PHOSPHATE, 0.003 - 0.02 PER CENT BY WEIGHT OF A MIXTURE OF SODIUM SALTS OF SECONDARY ALKYLSULPHATES HAVING THE GENERAL FORMULA R-OSO3NA, WHERE R IS A HYDROCARBON RADICAL, CONTAINING FROM 8 TO 1, CARBON ATOMS, AND 0.15-0.35 PERCENT BY WEIGHT OF CALCIUM CARBONATE, WHICH IS INTRODUCED INTO HEPROCESS OF SUSPENSION POLYMERIZATION AT A TEMPERATUE NOT ABOVE 90*C.
Claim 3
Independent Claim
174 words
A method for preparing shock-resistant grafter copolymers of vinyltoluene with synthetic rubber consisting in dissolution of rubber in vinyltoluene at a temperature of 20* to 80*C, heating the obtained solution at a temperature from 85* to 125*C in the presence of a plasticizer and a regulator of molecular weight until the conversion of vinyltoluene is 25-40 per cent with formation of pre-polymer; suspension polymerization of the pre-polymer by heating it in an aqueous medium to the temperature not above 140*C at the ratio of the pre-polymer to water of 5:3 to 10:3 respectively in the presence of initiators of polymerization and a stabilizing system consisting of 0.15 - 1.5 per cent by weight of tricalcium phosphate, 0.003 - 0.02 per cent by weight of a mixture of sodium salts of secondary alkylsulphates, having the general formula R-OSO3Na, where R is a hydrocarbon radical having from 8 to 18 carbon atoms, and 0.15-0.35 per cent by weight of calcium carbonate, which is introduced in the process of suspension polymerization at a temperature not above 90*C.
Claim 4
Independent Claim
174 words
A method for preparing shock-resistant grafter copolymers of vinyltoluene with synthetic rubber consisting in dissolution of rubber in vinyltoluene at a temperature of 20* to 80*C, heating the obtained solution at a temperature from 85* to 125*C in the presence of a plasticizer and a regulator of molecular weight until the conversion of vinyltoluene is 25-40 per cent with formation of pre-polymer; suspension polymerization of the pre-polymer by heating it in an aqueous medium to the temperature not above 140*C at the ratio of the pre-polymer to water of 5:3 to 10:3 respectively in the presence of initiators of polymerization and a stabilizing system consisting of 0.15 - 1.5 per cent by weight of tricalcium phosphate, 0.003 - 0.02 per cent by weight of a mixture of sodium salts of secondary alkylsulphates, having the general formula R-OSO3Na, where R is a hydrocarbon radical having from 8 to 18 carbon atoms, and 0.15-0.35 per cent by weight of calcium carbonate, which is introduced in the process of suspension polymerization at a temperature not above 90*C.
Claim 5
Dependent Claim
21 words
A method according to claim 1, in which tricalcium phsophate is taken in the quantity of 0.2-0.7 per cent by weight.
Claim 6
Dependent Claim
21 words
A method according to claim 2, in which tricalcium phosphate is taken in the quantity of 0.2-0.7 per cent by weight.
Claim 7
Dependent Claim
27 words
A method according to claim 1, in which a mixture of sodium salts of secondary alkylsulphates is taken in The quantity of 0.003-0.008 per cent by weight.
Claim 8
Dependent Claim
29 words
A method according to claim 2, in which a mixture of sodium salts of secondary alkylsulphates is taken in the quantity of 0.003 - 0.008 per cent by weight.
Claim 9
Dependent Claim
29 words
A method according to claim 1, in which the suspension polymerization of the pre-polymer is carried out at the ratio of the prepolymer to water from 5:3 to 9:3.
Claim 10
Dependent Claim
29 words
A method according to claim 2, in which the suspension polymerization of the pre-polymer is carried out at the ratio of the pre-polymer to water from 5:3 to 9:3.
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) | 1978-11-10 | 1979-05-12 | 1979-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-10 | 1983-05-12 | 1983-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-10 | 1987-05-12 | 1987-11-11 | $7700.00 | Window Closed / Lapsed |