Bridged dense star polymers

Details Bridged dense star polymers Bridged dense star polymers

1986-12-08

1988-04-12

Anderson, Harold D.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525419, 525420, 525540, 528271, 528310, 528332, 528350, 528363, 528373, 528374, 528397, 528403, 528405, 528422, 528425, C08G 8300

Patent

active

047375507

ABSTRACT:
Bridged dense star polymers having terminal group densities greater than conventional extended star polymers exhibit greater and more uniform reactivity than their corresponding conventional star polymers. For example, a third generation, hydroxy-terminated polyether dense star polymer can be prepared from pentaerythrityltetrabromide and 4-hydroxymethyl-2,6,7-trioxabicyclo[2.2.2]-octane which has a molecular volume less than 80 percent of the volume of a conventional extended star polymer made from similar materials. This dense star polymer can then be bridged by reacting it with a suitable difunctional reactant such as toluene diisocyanate. Such polymers of dense star polymers are useful as demulsifiers for oil/water emulsions, wet strength agents in the manufacture of paper, proton scavengers, calibration standards for electron microscopy, and agents for modifying viscosity in aqueous formulations such as paints.

REFERENCES:
patent: 4631337 (1986-12-01), Tomalia et al.

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