US3880773A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lead-silicate composite stabilizers
Assignee: Associated Lead Inc
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Filing: 1973-05-14
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Granted: 1975-04-29
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Expires: 1993-05-14
Abstract
Abstract Novel stabilizers for vinyl resins are described comprising a composite of a basic lead compound and a hydrous magnesium silicate such as a platey talc. Among the basic lead compounds are dibasic leas phosphite, basic lead salts of organic carboxylic acids and mixtures of dibasic lead phosphite and tribasic lead sulfate.
Inventors
- 👤 Edward L White
- 👤 Bernard Engelbart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:19
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/09; C08K3/00; C08K3/10; C08K3/11; C08K3/18; C08K3/24; C08K3/34
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
82 words
A COMPOSITE OF FROM 30 TO 80 PERCENT BY WEIGHT OF A BASIC LEAD COMPOUND AND FROM 20 TO 70 PERCENT BY WEIGHT OF A HYDROUS MAGNESIUM SILICATE; SAID BASIC LEAD COMPOUND REPRESENTED BY THE FORMULA: N PBO .PB A; WHEREIN N IS A NUMBER FROM 1 TO 4 AND A IS AN ANION RADICAL SELECTED FROM THE GROUP CONSISTING OF PHOSPHITE, ORGANIC CARBOXYLATE, MIXTURES OF PHOSPHITE AND SULFATE, MIXTURES OF PHOSPHITE AND ORGANIC CARBOXYLATE AND MIXTURES OF SULFATE AND ORGANIC CARBOXYLATE.
Claim 2
Dependent Claim
82 words
A COMPOSITE OF FROM 30 TO 80 PERCENT BY WEIGHT OF A BASIC LEAD COMPOUND AND FROM 20 TO 70 PERCENT BY WEIGHT OF A HYDROUS MAGNESIUM SILICATE; SAID BASIC LEAD COMPOUND REPRESENTED BY THE FORMULA: N PBO .PB A; WHEREIN N IS A NUMBER FROM 1 TO 4 AND A IS AN ANION RADICAL SELECTED FROM THE GROUP CONSISTING OF PHOSPHITE, ORGANIC CARBOXYLATE, MIXTURES OF PHOSPHITE AND SULFATE, MIXTURES OF PHOSPHITE AND ORGANIC CARBOXYLATE AND MIXTURES OF SULFATE AND ORGANIC CARBOXYLATE.
Claim 3
Dependent Claim
33 words
The composite of claim 1 wherein said hydrous magnesium silicate is a talc having from about 59 to 64 percent combined SiO2 and from about 28 to 32 percent combined MgO by weight.
Claim 4
Dependent Claim
96 words
A composite of from 30 to 80 percent by weight of a basic lead compound and from 20 to 70 percent by weight of a talc substrate, said basic lead compound represented by the formula; n PbO . Pb A; wherein n is a number from 1 to 4 and A is an anion radical selected from the group consisting of phosphite and sulfate, aliphatic carboxylate having from about 8 to 20 carbon atoms, aromatic carboxylate and, B- unsaturated discarboxylate; said talc containing 62 percent combined SiO2 by weight and 31 percent combined MgO by weight.
Claim 5
Dependent Claim
96 words
A composite of from 30 to 80 percent by weight of a basic lead compound and from 20 to 70 percent by weight of a talc substrate, said basic lead compound represented by the formula; n PbO . Pb A; wherein n is a number from 1 to 4 and A is an anion radical selected from the group consisting of phosphite and sulfate, aliphatic carboxylate having from about 8 to 20 carbon atoms, aromatic carboxylate and, B- unsaturated discarboxylate; said talc containing 62 percent combined SiO2 by weight and 31 percent combined MgO by weight.
Claim 6
Dependent Claim
12 words
The basic lead compound of claim 3 which comprises dibasic lead phosphite.
Claim 7
Dependent Claim
36 words
The basic lead compound of claim 3 which comprises a mixture of tribasic lead sulfate and dibasic lead phosphite wherein the weight ratio of tribasic lead sulfate to dibasic lead phosphite is from 1:1 to 3:1.
Claim 8
Dependent Claim
12 words
The basic lead compound of claim 3 which comprises dibasic lead stearate.
Claim 9
Dependent Claim
12 words
The basic lead compound of claim 3 which comprises dibasic lead phthalate.
Claim 10
Independent Claim
87 words
A method for producing a composite of a heat sensitive basic lead compound and a hydrous magnesium silicate comprising; a. forming a uniform aqueous slurry of a hydrous magnesium silicate, litharge and a catalyst, the weight of said litharge being from 1/3 to 3 times the weight of said hydrous magnesium silicate; b. adding to said slurry from 1/2 to 1/5 equivalents based on the amount of litharge in said slurry of a reactive acid to form said composite; and c. recovering said composite from said slurry.
Claim 11
Independent Claim
87 words
A method for producing a composite of a heat sensitive basic lead compound and a hydrous magnesium silicate comprising; a. forming a uniform aqueous slurry of a hydrous magnesium silicate, litharge and a catalyst, the weight of said litharge being from 1/3 to 3 times the weight of said hydrous magnesium silicate; b. adding to said slurry from 1/2 to 1/5 equivalents based on the amount of litharge in said slurry of a reactive acid to form said composite; and c. recovering said composite from said slurry.
Claim 12
Independent Claim
169 words
A method for producing a composite of a basic lead compound and talc; said basic lead compound represented by the formula: n PbO . Pb A wherein n is a number form 1 to 4 and A is an anion radical mixture selected from the group consisting of phosphite and sulfate, phosphite and organic carboxylate, and sulfate and organic carboxylate comprising; a. forming a uniform aqueous slurry of talc, said talc having from about 59 to 64 percent combined SiO2 and from about 28 to 32 percent combined MgO by weight, and Litharge, the weight of said litharge being from 1/3 to 3 times the weight of said talc; b. adding a catalyst to said sluRry; c. adding to said slurry from 1/2 to 1/5 equivalents based on the amount of litharge in said slurry of a reactive acid mixture to form said composite; said reactive acid mixture being the source of said anion radical mixture in said basic lead compounds; and d. recovering a composite from said slurry.
Claim 13
Independent Claim
169 words
A method for producing a composite of a basic lead compound and talc; said basic lead compound represented by the formula: n PbO . Pb A wherein n is a number form 1 to 4 and A is an anion radical mixture selected from the group consisting of phosphite and sulfate, phosphite and organic carboxylate, and sulfate and organic carboxylate comprising; a. forming a uniform aqueous slurry of talc, said talc having from about 59 to 64 percent combined SiO2 and from about 28 to 32 percent combined MgO by weight, and Litharge, the weight of said litharge being from 1/3 to 3 times the weight of said talc; b. adding a catalyst to said sluRry; c. adding to said slurry from 1/2 to 1/5 equivalents based on the amount of litharge in said slurry of a reactive acid mixture to form said composite; said reactive acid mixture being the source of said anion radical mixture in said basic lead compounds; and d. recovering a composite from said slurry.
Claim 14
Dependent Claim
15 words
The process of claim 8 wherein said reactive acid mixture comprises sulfuric and phosphorous acids.
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) | 1978-04-28 | 1978-10-28 | 1979-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-28 | 1982-10-28 | 1983-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-28 | 1986-10-28 | 1987-04-29 | $7700.00 | Window Closed / Lapsed |