US4200731A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Endcapped polyesters
Assignee: Shell USA Inc
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Filing: 1979-02-01
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Granted: 1980-04-29
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Expires: 1999-02-01
Abstract
Abstract The polyesters are endcapped by reacting them generally with substituted benzoyl-lactams or substituted benzoyl-phthalimides at a temperature usually above the melting point of the polyester to form a benzoyl end group. Such endcapped polymers have improved properties such as thermal-oxidative aging, molecular weight retention, tensile strength retention, and improved stability.
Inventors
- 👤 Fred L. Massey
- 👤 Trent A. Sponseller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:30
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/16; C08G63/20; C08G63/91; C08G63/914; C08G63/916
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
194 words
A process for endcapping a polyester, comprising the steps of: adding an endcapping compound to the polyester, said endcapping compound selected from the class consisting of ##STR7## where R 1 R 2 and R 3 are selected from the class consisting of hydrogen, a halide, an alkyl, an aryl, and an alkyl substituted aryl, and wherein n is 2 to 14, said halide selected from the class consisting of fluorine, chlorine, iodine and bromine, said alkyl having from 1 to 8 carbon atoms, said aryl having from 6 to 14 carbon atoms, said alkyl substituted aryl having from 5 to 15 carbon atoms, said polyester having at least one hydroxyl end group, the amount of said endcapping compound ranging from about 0.1 to about 3.0 equivalents per said hydroxyl end group, mixing said polyester polymer with said endcapping compound, heating said polyester polymer with said endcapping compound to at least the reaction temperature of said endcapping compound, and reacting said endcapping compound with said hydroxyl end group of said polyester so that said polyester contains an end group having the structure ##STR8## where R x is said R 1 or said R 2 .
Claim 2
Dependent Claim
194 words
A process for endcapping a polyester, comprising the steps of: adding an endcapping compound to the polyester, said endcapping compound selected from the class consisting of ##STR7## where R 1 R 2 and R 3 are selected from the class consisting of hydrogen, a halide, an alkyl, an aryl, and an alkyl substituted aryl, and wherein n is 2 to 14, said halide selected from the class consisting of fluorine, chlorine, iodine and bromine, said alkyl having from 1 to 8 carbon atoms, said aryl having from 6 to 14 carbon atoms, said alkyl substituted aryl having from 5 to 15 carbon atoms, said polyester having at least one hydroxyl end group, the amount of said endcapping compound ranging from about 0.1 to about 3.0 equivalents per said hydroxyl end group, mixing said polyester polymer with said endcapping compound, heating said polyester polymer with said endcapping compound to at least the reaction temperature of said endcapping compound, and reacting said endcapping compound with said hydroxyl end group of said polyester so that said polyester contains an end group having the structure ##STR8## where R x is said R 1 or said R 2 .
Claim 3
Dependent Claim
20 words
A process according to claim 1, wherein said heating temperature is at least the melting temperature of said polyester polymer.
Claim 4
Dependent Claim
19 words
A process according to claim 2, wherein said heating temperature ranges from about 220° C. to about 300° C.
Claim 5
Dependent Claim
27 words
A process according to claim 3, wherein R 1 , R 2 , and R 3 are hydrogen or said alkyl, and n is 4 or 5.
Claim 6
Dependent Claim
25 words
A process according to claim 4, wherein the amount of said endcapping compound ranges from about 1.0 to 2.2 equivalents per said hydroxyl end group.
Claim 7
Dependent Claim
28 words
A process according to claim 5, wherein R 1 and R 2 are hydrogen, and wherein said heating temperature ranges from about 255° C. to about 280° C.
Claim 8
Dependent Claim
19 words
A process according to claim 6, wherein the amount of said endcapping compound is about 1.0 to 1.1 equivalents.
Claim 9
Dependent Claim
112 words
A process according to claim 1, wherein said polyester compound is made from the reaction of dicarboxylic acids or esters and polyhydric alcohols, said dicarboxylic acids selected from the class consisting ofalkyl dicarboxylic acids having a total of from 2 to 16 carbon atoms, an alkyl ester having from 2 to 20 carbon atoms, aryl dicarboxylic acids containing a total of from 8 to about 16 carbon atoms, and an alkyl substituted aryl ester having from 10 to 20 carbon atoms, and wherein said polyhydric alcohol is selected from the class consisting of glycols having from 2 to 12 carbon atoms, and from glycol ethers containing from 4 to 12 carbon atoms.
Claim 10
Dependent Claim
53 words
A process according to claim 8, wherein said heating is at a temperature of at least the melting point of said polyester polymer and wherein said polyhydric alcohol is a glycol containing from 2 to 8 carbon atoms, and wherein said dicarboxylic acid is said aryl dicarboxylic or said substituted aryl dicarboxylic acid.
Claim 11
Dependent Claim
20 words
A process according to claim 9, wherein R 1 , R 2 and R 3 are hydrogen or said alkyl.
Claim 12
Dependent Claim
25 words
A process according to claim 10, wherein the amount of said endcapping compound ranges from about 1.0 to about 2.2 equivalents per hydroxyl end group.
Claim 13
Dependent Claim
37 words
A process according to claim 11, wherein said dicarboxylic acid is selected from the class consisting of dimethylterephthalic acid or terephthalic acid and said glycol is selected from the class consisting of ethylene glycol and 1,4-butane diol.
Claim 14
Dependent Claim
26 words
A process according to claim 12, wherein said endcapping compound is N-benzoyl-E-caprolactam and wherein said heating temperature ranges from about 255° C. to about 270° C.
Claim 15
Dependent Claim
90 words
A polyester polymer composition, comprising: a plurality of polyester chains, a substantial number of said polyesters having at least one end group of the formula ##STR9## wherein R is selected from the class consisting of hydrogen, a halide, an alkyl, an aryl, and an alkyl substituted aryl, said halide selected from the class consisting of fluorine, chlorine, iodine, and bromine, said alkyl having from 1 to 8 carbon atoms, said aryl having from 6 to 14 carbon atoms, and said alkyl substituted aryl having from 5 to 15 carbon atoms.
Claim 16
Dependent Claim
90 words
A polyester polymer composition, comprising: a plurality of polyester chains, a substantial number of said polyesters having at least one end group of the formula ##STR9## wherein R is selected from the class consisting of hydrogen, a halide, an alkyl, an aryl, and an alkyl substituted aryl, said halide selected from the class consisting of fluorine, chlorine, iodine, and bromine, said alkyl having from 1 to 8 carbon atoms, said aryl having from 6 to 14 carbon atoms, and said alkyl substituted aryl having from 5 to 15 carbon atoms.
Claim 17
Dependent Claim
14 words
A polyester composition according to claim 14, wherein R is hydrogen or said alkyl.
Claim 18
Dependent Claim
11 words
A polyester composition according to claim 15, wherein R is hydrogen.
Claim 19
Dependent Claim
117 words
A polyester composition according to claim 14, wherein said polyester polymer is made from the reaction of dicarboxylic acids or esters and polyhydric alcohols, said dicarboxylic acid or ester being selected from the class consisting of alkyl dicarboxylic acids having a total of from 2 to 16 carbon atoms, an alkyl ester having from 2 to 20 carbon atoms, aryl dicarboxylic acids containing a total of from 8 to about 16 carbon atoms, and an alkyl substituted aryl ester having from 10 to 20 carbon atoms, and wherein said polyhydric alcohol is selected from the class consisting of glycols having from 2 to 12 carbon atoms, and from glycol ethers containing from 4 to 12 carbon atoms.
Claim 20
Dependent Claim
38 words
A polyester composition according to claim 17, wherein said polyhydric alcohol is a glycol containing from 2 to 8 carbon atoms, and wherein said dicarboxylic acid is said aryl dicarboxylic acid or said alkyl substituted aryl dicarboxylic acid.
Claim 21
Dependent Claim
14 words
A polyester composition according to claim 18, wherein R is hydrogen or said alkyl.
Claim 22
Dependent Claim
32 words
A polyester composition according to claim 19, wherein R is hydrogen and wherein said polyester is made from dimethylterephthalic acid or terephthalic acid and said glycol is ethylene glycol or 1,4-butane diol.
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) | 1983-04-29 | 1983-10-29 | 1984-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-04-29 | 1987-10-29 | 1988-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-04-29 | 1991-10-29 | 1992-04-29 | $7700.00 | Window Closed / Lapsed |