US3849152A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polysiloxane encapsulation of pigments
Assignee: Vibrantz Corp
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Filing: 1972-11-06
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Granted: 1974-11-19
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Expires: 1992-11-06
Abstract
Abstract Pigments, and particularly chrome-based pigments such as lead chromate, are disclosed having improved dispersion, color strength, and heat and light stability when incorporated, for example, in moldable polymeric resinous systems. Particles of the pigments are completely covered with a polysiloxane liquid at room temperatures. The polysiloxane is then polymerized in situ to a solid form completely to encapsulate and protect the enveloped pigment particles. Preferably the pigment particles contain reactive hydroxyl groups, and the polysiloxane reacts with the hydroxyl groups to aid in binding the polysiloxane envelope to the pigment particle.
Inventors
- 👤 V Mimeault
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:24
CPC Classifications
C; C09; C09C; C09C3/00; C09C3/12; C01; C01P; C01P2004/00; C01P2004/80; C01P2006/00; C01P2006/60; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2998
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
58 words
COMPLETELY ENCAPSULATED PIGMENT PARTICLES OF IMPROVED DISPERSION, COLOR STRENGTH, AND HEAT AND LIGHT STABILITY FOR INCORPORATION INTO A MOLDABLE POLYMERIC RESINOUS SYSTEM, SAID PIGMENT BEING A CHROME-BASED PIGMENT, AND THE ENCAPSULATION OF SAID PARTICLES BEING A COMPLETELY ENCOMPASSING, CONTINUOUS, ADHERENT, PROTECTIVE ENVELOPE CONSISTING ESSENTIALLY OF A POLYSILOXANE HAVING A SUFFICIENT POLYMERIC GROWTH TO BE SOLID AT ROOM TEMPERATURE.
Claim 2
Dependent Claim
58 words
COMPLETELY ENCAPSULATED PIGMENT PARTICLES OF IMPROVED DISPERSION, COLOR STRENGTH, AND HEAT AND LIGHT STABILITY FOR INCORPORATION INTO A MOLDABLE POLYMERIC RESINOUS SYSTEM, SAID PIGMENT BEING A CHROME-BASED PIGMENT, AND THE ENCAPSULATION OF SAID PARTICLES BEING A COMPLETELY ENCOMPASSING, CONTINUOUS, ADHERENT, PROTECTIVE ENVELOPE CONSISTING ESSENTIALLY OF A POLYSILOXANE HAVING A SUFFICIENT POLYMERIC GROWTH TO BE SOLID AT ROOM TEMPERATURE.
Claim 3
Dependent Claim
32 words
The encapsulated pigment particles of claim 1 in which said polysiloxane consists essentially from about 5 to about 35 percent by weight of the total combined weight of pigment particles and polysiloxane.
Claim 4
Dependent Claim
18 words
The pigment of claim 1 in which said polysiloxane has a repeating linear unit having the general formula:
Claim 5
Dependent Claim
39 words
The pigment of claim 1 in which said continuous envelope includes the reaction product of said polysiloxane and reactive hydroxyl groups on the surface of at least one of said particles to bind the covering to said one particle.
Claim 6
Dependent Claim
63 words
A process for preparing encapsulated chrome-based pigment particles of improved dispersion, color strength, and heat and light stability for incorporation into a moldable polymeric resinous system, comprising admixing said pigment particles with a polysiloxane liquid at room temperatures and in an amount to coat said particles completely, and then heating the coated particles to polymerize the polysiloxane in situ to a solid form.
Claim 7
Dependent Claim
63 words
A process for preparing encapsulated chrome-based pigment particles of improved dispersion, color strength, and heat and light stability for incorporation into a moldable polymeric resinous system, comprising admixing said pigment particles with a polysiloxane liquid at room temperatures and in an amount to coat said particles completely, and then heating the coated particles to polymerize the polysiloxane in situ to a solid form.
Claim 8
Dependent Claim
41 words
The process of claim 5 including providing reactive hydroxyl groups on said pigment particles prior to enveloping said particles with the polysiloxane, and subsequently reacting said polysiloxane with said hydroxyl groups to aid in binding the polysiloxane to the pigment particles.
Claim 9
Dependent Claim
19 words
The process of claim 5 in which said liquid polysiloxane has a repeating linear unit having the general formula:
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) | 1977-11-18 | 1978-05-20 | 1978-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-18 | 1982-05-20 | 1982-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-18 | 1986-05-20 | 1986-11-19 | $7700.00 | Window Closed / Lapsed |