US 4,803,245 A · Flexibilized phenol/mercapto resins and their synthesis

Abstract

Disclosed is a method for improving the flexibility of a phenol or mercapto resin wherein an aliphatic hydroxyl-functional polyol or polyepoxide component is partially capped with a phenol or mercapto capping agent followed by chain extension with a polyisocyanate under reaction conditions wherein said polyisocyanate substantially selectively reacts with aliphatic hydroxyl groups or epoxy groups residual from the prior step of the process. The ratio of components is such that a resin predominating in one or more of the following general structures is produced: ##STR1## where, R and R' each is a phenol functional group or a mercapto functional group, A and B each is an organic chain residue of said component containing functionality epoxy, Poly and Poly' each is an organic chain residue of said component containing aliphatic hydroxy functionality, X is an aliphatic hydroxyl group, the wavy line represents an organic chain residue of said polyisocyanate, n is 1-4, m and p each is 0-2, and q and s each is 1-15.

Claims16

Dependent claims

A method for improving the flexibility of a phenol or mercapto resin which comprises:

(a) reacting a component containing functionality selected from the group consisting of aliphatic hydroxyl functionality, epoxy functionality, or mixtures thereof, with a capping agent bearing functionality selected from phenol functionality, mercapto functionality, or mixtures thereof, and containing functionality reactive with said component to form a phenolic or mercapto functional adduct;
and
(b) reacting the adduct of the step (a) with a polyisocyanate in the substantial absence of a basic urethane catalyst, said reactants being present in a ratio to produce said resin predominating in one or more of the following general structures:
##STR4## where, R and R' each is a phenol functional group or a mercapto functional group,
A and B each is an organic chain residue of said component containing epoxy functionality,
Poly and Poly' each is an organic chain residue of said component containing aliphatic hydroxyl functionality,
X is an aliphatic hydroxyl group,
the wavy line represents an organic chain residue of said polyisocyanate,
n is 1-4,
m and p each is 0-2, and
q and s each is 1-15.

8 more elements

A flexibilized phenol or mercapto resin represented by one or more of the following general structures:

##STR6## where, R and R' each is a phenol functional group or a mercapto functional group,
A and B each is an organic chain residue of an epoxy component,
Poly and Poly' each is an organic chain residue of an aliphatic hydroxyl component,
X is an aliphatic hydroxyl group,
the wavy line represents an organic chain residue of said polyisocyanate,
n is 1-4,
m and p each is 0-2, and
q and s each is 1-15,
said resin being synthesized by reacting a phenol or mercapto capping agent with an aliphatic hydroxyl component containing epoxy functionality or component, followed by reaction with a polyisocyanate in the substantial absence of basic urethane catalyst to produce said resin.

6 more elements

Dependencies are inferred from the claim text.

Flexibilized phenol/mercapto resins and their synthesis

Life of this patent

Flexibilized phenol/mercapto resins and their synthesis

Life of this patent

Abstract

Claims16