US4758603A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dithiocarbamate internal mold release agents
Assignee: Dow Chemical Co
•
Filing: 1987-08-28
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Granted: 1988-07-19
•
Expires: 2007-08-28
Abstract
Abstract A method of making a reaction injection molded polyurethane having enhanced mold release properties is provided. An effective amount at least one dithiocarbamate is injected into a mold cavity with at least one a polyisocyanate component and at least one an active hydrogen component. Polyurethanes having enhanced mold release properties are formed using a composition of matter comprising at least 0.25 parts per hundred parts by weight of active hydrogen components of a dithiocarbamate of the formula: ##STR1## wherein M and the R groups are described herein.
Inventors
- 👤 Robert Carswell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:59
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; B; B29; B29C; B29C33/00; B29C33/56; B29C33/60; C08K; C08K5/00; C08K5/36; C08K5/39; B29C67/00; B29C67/24; B29C67/246; B29K; B29K2075/00; C08G2120/00
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
56 words
A method of making a reaction injection molded polyurethane having enhanced mold release properties comprising injecting into a mold cavity a formulation comprising: (a) at least one a polyisocyanate component: (b) at least one an active hydrogen component: and (c) an amount effective to enhance mold release properties of the polyurethane of at least one dithiocarbamate.
Claim 2
Independent Claim
56 words
A method of making a reaction injection molded polyurethane having enhanced mold release properties comprising injecting into a mold cavity a formulation comprising: (a) at least one a polyisocyanate component: (b) at least one an active hydrogen component: and (c) an amount effective to enhance mold release properties of the polyurethane of at least one dithiocarbamate.
Claim 3
Dependent Claim
12 words
The method of claim 1 wherein the dithiocarbamate is a metal dithiocarbamate.
Claim 4
Dependent Claim
13 words
The method of claim 1 wherein the dithiocarbamate is a substituted metal dithiocarbamate.
Claim 5
Dependent Claim
22 words
The method of claim 1 wherein the dithiocarbamate is selected from the group consisting of alkylene dithiocarbamates, arylene dithiocarbamates and alkylarylene dithiocarbamates.
Claim 6
Dependent Claim
93 words
The method of claim 1 wherein the dithiocarbamate is of the formula: ##STR5## where R 1 and R 4 are independently selected from the group consisting of hydrogen, alkyl, aryl or alkylaryl groups which are unsubstituted or inertly substituted and have from one to forty carbon atoms, R 2 and R 3 are independently selected from the group consisting of unsubstituted or inertly substituted alkyl, aryl and alkylaryl groups of one to about forty carbon atoms, and M is a metal atom selected from the group consisting of antimony, copper, lead, and zinc.
Claim 7
Dependent Claim
12 words
The method of claim 5 wherein the metal atom, M, is antimony.
Claim 8
Dependent Claim
45 words
The method of claim 5 wherein R 1 and R 4 are both hydrogen and R 2 and R 3 are independently selected from the group consisting of unsubstituted or inertly substituted alkyl, aryl and alkylaryl groups of about four to about forty carbon atoms.
Claim 9
Dependent Claim
25 words
The method of claim 5 wherein R 2 and R 3 are both unsubstituted alkyl groups of from about 3 to about 20 carbon atoms.
Claim 10
Dependent Claim
16 words
The method of claim 1 wherein the formulation additionally comprises a second internal mold release agent.
Claim 11
Dependent Claim
20 words
The method of claim 9 wherein the second internal mold release agent is a zinc salt of a carboxylic acid.
Claim 12
Dependent Claim
16 words
The method of claim 9 wherein the second internal mold release agent is a silicon-containing compound.
Claim 13
Dependent Claim
16 words
The method of claim 5 wherein at least one active hydrogen component comprises a polyether polyol.
Claim 14
Dependent Claim
17 words
The method of claim 12 wherein the polyether polyol is admixed with at least one chain extender.
Claim 15
Dependent Claim
13 words
The method of claim 13 wherein the chain extender comprises an aromatic diamine.
Claim 16
Dependent Claim
32 words
The method of claim 1 wherein a least one polyisocyanate component is selected from the group consisting of 2,6-toluene diisocyanate: 2,4-toluene diisocyanate: diphenylmethane-4, 4'-diisocyanate; diphenylmethane-2,4'-diisocyanate, 4,4'-dicyclohexane diisocyanate, isophorone diisocyanate and mixtures thereof.
Claim 17
Dependent Claim
17 words
The method of claim 1 wherein the polyurethane has a density of at least 0.8 grams/cubic centimeter.
Claim 18
Dependent Claim
27 words
The method of claim 1 wherein the dithiocarbamate is used in an amount of at least about 0.25 percent by weight based on total active hydrogen component.
Claim 19
Dependent Claim
28 words
The method of claim 1 wherein the dithiocarbamate is used in an amount of from about 0.25 to 10 percent by weight based on total active hydrogen component.
Claim 20
Dependent Claim
128 words
A composition of matter comprising (a) at least one active hydrogen component; and (b) at least 0.25 parts by weight, based on 100 parts of total active hydrogen component, of a dithiocarbamate of the formula: where R 1 and R 4 are ##STR6## independently selected from the group consisting of hydrogen, alkyl, aryl or alkylaryl groups which are unsubstituted or inertly substituted and have from one to about forty carbon atoms; R 2 and R 3 are independently selected from the group consisting of unsubstituted or inertly substituted alkyl, aryl and alkylaryl groups of one to about forty carbon atoms, and M" is selected from the group consisting of substituted metal atoms and metal atoms selected from the group consisting of antimony, copper, lead, zinc, and mixtures thereof.
Claim 21
Dependent Claim
128 words
A composition of matter comprising (a) at least one active hydrogen component; and (b) at least 0.25 parts by weight, based on 100 parts of total active hydrogen component, of a dithiocarbamate of the formula: where R 1 and R 4 are ##STR6## independently selected from the group consisting of hydrogen, alkyl, aryl or alkylaryl groups which are unsubstituted or inertly substituted and have from one to about forty carbon atoms; R 2 and R 3 are independently selected from the group consisting of unsubstituted or inertly substituted alkyl, aryl and alkylaryl groups of one to about forty carbon atoms, and M" is selected from the group consisting of substituted metal atoms and metal atoms selected from the group consisting of antimony, copper, lead, zinc, and mixtures thereof.
Claim 22
Dependent Claim
22 words
The composition of claim 19 wherein M is a metal atom selected from the group consisting of antimony, copper, lead and zinc.
Claim 23
Dependent Claim
11 words
The composition of claim 19 wherein M is an antimony atom.
Claim 24
Dependent Claim
45 words
The composition of claim 19 wherein R 1 and R 4 are both hydrogen; and R 2 and R 3 are independently selected from the group consisting of unsubstituted or inertly substituted alkyl, aryl and alkylaryl groups of about four to about forty carbon atoms.
Claim 25
Dependent Claim
25 words
The composition of claim 19 wherein R 2 and R 3 are both unsubstituted alkyl groups of from about 4 to about 20 carbon atoms.
Claim 26
Dependent Claim
16 words
The composition of claim 19 wherein the composition additionally comprises a second internal mold release agent.
Claim 27
Dependent Claim
20 words
The composition of claim 24 wherein the second internal mold release agent is a zinc salt of a carboxylic acid.
Claim 28
Dependent Claim
16 words
The composition of claim 24 wherein the second internal mold release agent is a silicon-containing compound.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-07-19 | 1992-01-18 | 1992-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-07-19 | 1996-01-18 | 1996-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-07-19 | 2000-01-18 | 2000-07-19 | $7700.00 | Window Closed / Lapsed |