Patent US4384048A successfully refreshed from Google Patents.
US4384048A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chemical blowing agent
Assignee: Bayer AG
•
Filing: 1982-07-07
•
Granted: 1983-05-17
•
Expires: 2002-07-07
Abstract
Abstract A composition comprising a blowing agent and an activator characterised in that a mixture of the blowing agent and activator is comminuted to a particle size less than 5 micrometres, methods of making the composition and the use of the compositions in expanding polymers.
Inventors
- 👤 Raymond J. Bathgate
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:54
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/06; C08J9/10; C08J9/101; Y; Y10; Y10S; Y10S264/00; Y10S264/05; Y10S521/00; Y10S521/909; Y10S521/91
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
61 words
An expandable polymer composition comprising a thermoplastic polymer and a blowing agent composition comprising a mixture of a thermally decomposable blowing agent and an activator for the blowing agent characterized in that the mixture has been comminuted to a mean particle size of less than 5 micrometers, wherein said blowing agent and activator in said mixture are solids prior to comminution.
Claim 2
Dependent Claim
61 words
An expandable polymer composition comprising a thermoplastic polymer and a blowing agent composition comprising a mixture of a thermally decomposable blowing agent and an activator for the blowing agent characterized in that the mixture has been comminuted to a mean particle size of less than 5 micrometers, wherein said blowing agent and activator in said mixture are solids prior to comminution.
Claim 3
Dependent Claim
101 words
A pre-mix composition suitable for incorporation into a polymer composition so as to form an expandable polymer composition which pre-mix composition comprises a polymer or a plasticizer for the polymer and from 15 to 230 parts by weight of a blowing agent composition comprising a mixture of a thermally decomposable blowing agent and an activator for the blowing agent characterized in that the mixture has been comminuted to a mean particle size of less than 5 micrometers, per 100 parts by weight of the polymer or plasticizer, wherein said blowing agent and activator in said mixture are solids prior to comminution.
Claim 4
Dependent Claim
101 words
A pre-mix composition suitable for incorporation into a polymer composition so as to form an expandable polymer composition which pre-mix composition comprises a polymer or a plasticizer for the polymer and from 15 to 230 parts by weight of a blowing agent composition comprising a mixture of a thermally decomposable blowing agent and an activator for the blowing agent characterized in that the mixture has been comminuted to a mean particle size of less than 5 micrometers, per 100 parts by weight of the polymer or plasticizer, wherein said blowing agent and activator in said mixture are solids prior to comminution.
Claim 5
Dependent Claim
30 words
A composition as claimed in claim 1 wherein the blowing agent composition is present in from 0.01 to 30 parts by weight per 100 parts by weight of the polymer.
Claim 6
Dependent Claim
20 words
A composition as claimed in claim 1 wherein the blowing agent is selected from an azo compound or a sulphonhydrazide.
Claim 7
Dependent Claim
27 words
A composition as claimed in claim 1 wherein the activator for the blowing agent is selected from amines and amides, urea, sulphonhydrazides, metal salts, oxides or soaps.
Claim 8
Dependent Claim
27 words
A composition as claimed in claim 1 wherein the activator is used in weight ratios of 1:20 to 1:1 based on the weight of the blowing agent.
Claim 9
Dependent Claim
13 words
A composition as claimed in claim 4 wherein said azo compound is azodicarbonamide.
Claim 10
Dependent Claim
22 words
A composition as claimed in claim 5 wherein said amines and amides have alkyl groups containing from 1 to 10 carbon atoms.
Claim 11
Dependent Claim
23 words
A composition as claimed in claim 5 wherein said metal salts and oxides are oxides or salts of zinc, cadmium, lead or tin.
Claim 12
Dependent Claim
20 words
A composition as claimed in claim 2 wherein the blowing agent is selected from an azo compound or a sulphonhydrazide.
Claim 13
Dependent Claim
27 words
A composition as claimed in claim 2 wherein the activator for the blowing agent is selected from amines and amides, urea, sulphonhydrazides, metal salts, oxides or soaps.
Claim 14
Dependent Claim
27 words
A composition as claimed in claim 2 wherein the activator is used in weight ratios of 1:20 to 1:1 based on the weight of the blowing agent.
Claim 15
Dependent Claim
13 words
A composition as claimed in claim 10 wherein said azo compound is azodicarbonamide.
Claim 16
Dependent Claim
22 words
A composition as claimed in claim 11 wherein said amines and amides have alkyl groups containing from 1 to 10 carbon atoms.
Claim 17
Dependent Claim
23 words
A composition as claimed in claim 11 wherein said metal salts and oxides are oxides or salts of zinc, cadmium, lead or tin.
References Cited (Backward Citations)
US3511787A
Cited
US3340209A
Cited
US3502754A
Cited
US3658730A
Cited
US4183822A
Cited
US4263165A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-05-16 | 1986-11-15 | 1987-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-05-16 | 1990-11-15 | 1991-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-05-16 | 1994-11-15 | 1995-05-17 | $7700.00 | Window Closed / Lapsed |