US3607473A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compositions for and method of pretreating plastic surfaces to improve adhesion of coating materials
Assignee: MacDermid Inc
•
Filing: 1968-03-04
•
Granted: 1971-09-21
•
Expires: 1988-03-04
Abstract
Abstract Bath compositions and processes are disclosed for use in pretreating the surface of various synthetic molded plastics to improve adhesion to the surface thereof of films of different coating materials, such as paint, ink and adhesives, for example. An aqueous emulsion of an organic surface activating agent, followed by a strong acid aqueous oxidizing solution, are employed in the treatment of the plastic surface to effect the desired surface modification.
Inventors
- 👤 John J Grunwald
- 👤 John P Homrok
- 👤 Ralph R Wilkinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:48
CPC Classifications
C; C08; C08J; C08J7/00; C08J7/02
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
12 words
The process as defined in claim 1, wherein the plastic is polypropylene.
Claim 2
Dependent Claim
33 words
The process as defined in claim 2, wherein said aqueous emulsion has the following relative component composition per liter of solution: a. turpentine -50 mls. b. surfactant -50 mls. c. water -900 mls.
Claim 3
Dependent Claim
33 words
The process as defined in claim 3, wherein the plastic is immersed in said emulsion for from 1 to 15 minutes while maintaining the emulsion at a temperature of 145* to 155* F.
Claim 4
Dependent Claim
61 words
The method of preparing the emulsion defined in claim 3, which comprises admixing the components in the ratio of 50 mls. of turpentine and 40 mls. of surfactant, heating this mixture to 130* F. and adding it to the water, and finally heating this mixture to 150* Fl. and adding the remaining 10 mls. of surfactant, to make a clear emulsion.
Claim 5
Dependent Claim
34 words
The process as defined in claim 2, wherein said aqueous emulsion has the following relative component composition per liter of solution: a. linseed oil -50 mls. b. surfactant -50 mls. c. water -900 mls.
Claim 6
Dependent Claim
31 words
The process as defined in claim 6, wherein said emulsion is maintained at a temperature of about 170* F. and the plastic is immersed in this emulsion for about 15 minutes.
Claim 7
Dependent Claim
33 words
The process as defined in claim 2, wherein said aqueous emulsion has the following relative component composition per liter of solution: a. trichloroethylene -50 mls. b. surfactant -50 mls. c. water -900 mls.
Claim 8
Dependent Claim
32 words
The process as defined in claim 8, wherein the plastic is immersed in said emulsion for 12 to 15 minutes while maintaining the emulsion at a temperature of 180* to 190* F.
Claim 9
Dependent Claim
37 words
The process as defined in claim 2, wherein said aqueous emulsion has the following relative component composition per liter of solution: a. dichlorobenzene -25 mls. b. chlorobenzene -25 mls. c. surfactant -50 mls. d. water -900 mls.
Claim 10
Dependent Claim
33 words
The process as defined in claim 10, wherein the plastic is immersed in said emulsion for a period of about 15 minutes while maintaining said emulsion at a temperature of about 185* F.
Claim 11
Dependent Claim
29 words
The process as defined in claim 1, wherein said aqueous-oxidizing solution contains at least 5 percent by weight chromic acid and at least 15 percent by weight sulfuric acid.
Claim 12
Dependent Claim
31 words
The process as defined in claim 12, wherein said oxidizing solution contains: a. chromic acid -15 percent by wt. b. sulfuric acid-40 percent by wt. c. water -45 percent by wt.
Claim 13
Dependent Claim
22 words
The process as defined in claim 13, wherein the plastic is immersed in the oxidizing solution for 5 minutes at 175* F.
Claim 14
Dependent Claim
28 words
The process as defined in claim 1, wherein the chromium-reducing solution consists essentially, in addition to water, of about 0.25 of solution of sodium sulfate and sodium bisulfite.
Claim 15
Dependent Claim
36 words
The process of claim 1, wherein the said emulsion comprises about 35 to about 90 mls./liter of the surface-activating agent and about 50 to about 90 mls./liter of the said surfactant with the balance being water.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |