Endcapped, chain-extended and branched polyesters

• US 5,089,598 A
• Filed: 10/05/1990
• Issued: 02/18/1992
• Est. Priority Date: 10/05/1990
• Status: Expired due to Fees

• Current Assignee: General Electric Company
• Original Assignee: General Electric Company
• Inventors: Derudder, James L., Hawkins, Christopher M., Bostick, Edgar E.
• Primary Examiner(s): Welsh, Maurice J.
• Assistant Examiner(s): ACQUAH, SAMUEL A
• Application Number:
  US07/594,599
• Time in Patent Office: 501 Days
• Field of Search: 528/272, 528/283, 528/395, 525/437, 525/446
• US Class Current: 528/272
• CPC Class Codes: C08G 63/6954 derived from polxycarboxylic acids and polyhydroxy compounds

Abstract

Silane esters are transesterified with hydroxyl-terminated polyester resins to obtain end-capped, extended or branched polyester molding compositions.

Claims

1. A resin which comprises a polyester resin, end-capped with a monovalent moiety of the formula:

##STR7## wherein R₁, R₂ and R₃ are each independently selected from the group consisting of hydrocarbyl, halogen-substituted hydrocarbyl and hydrocarbyloxy.

2. The resin of claim 1 wherein one of R₁, R₂ and R₃ is hydrocarbyloxy.

3. The resin of claim 1 wherein two of R₁, R₂ and R₃ are hydrocarbyloxy.

4. The resin of claim 1 wherein each of R₁, R₂ and R₃ are hydrocarbyloxy.

5. The resin of claim 1 wherein each of R₁, R₂ and R₃ is phenoxy.

6. The resin of claim 1 having the formula:

##STR8##

7. A chain extended polyester resin of the schematic formula:

##STR9## wherein R₂ and R₃ are each independently selected from the group consisting of hydrocarbyl, halogen-substituted hydrocarbyl and hydrocarbyloxy;

X represents hydroxyl, a monovalent moiety of the formula;

##STR10## wherein R₂ is as defined above and R₁ and R₃ each represent independently selected R₂, or one or more additional polyester segments joined through the moiety of formula (I) given above.

8. A branched polyester resin selected from those of the formulae:

##STR11## wherein R₂ represents a group selected from those consisting of hydrocarbyl, halogen-substituted hydrocarbyl and hydrocarbyloxy;

X represents hydroxyl, a monovalent moiety of the formula;

##STR12## wherein R₂ is as defined above and R₁ and R₃ each represent independently selected R₂, or one or more additional polyester segments joined through the moiety of formula (I) given above.

9. A thermoplastic resin composition which comprises the transesterification product of a hydroxyl-terminated polyester and a silane ester of the formula:

##STR13## wherein R₁, R₂ and R₃ are each independently selected from the group consisting of hydrocarbyl, halogen-substituted hydrocarbyl and hydrocarbyloxy; and

R represents hydrocarbyl.

10. The product of claim 9 wherein R, R₁, R₂ and R₃ are each phenoxy.