# US 4,398,008 A · Thick polyol (allyl carbonate) polymerizates and method of preparing same

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- Number: US 4,398,008 A
- Document ID: US4398008A
- Status: Granted
- Kind: A
- Application number: 06/327,871
- Filed: 1981-12-07
- Granted: 1983-08-09
- Earliest claimed: 1981-12-07
- Assignees: PPG Industries, Inc.
- Inventors: Michael S. Misura
- Web page: https://patentgrep.com/patent/US4398008A

## CPC

- C08F 263/00: Macromolecular compounds obtained by polymerising monomers on to polymers of esters of unsaturated alcohols with saturated acids as defined in group C08F18/00
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS

## Abstract

Disclosed is a method of preparing a thick casting of polyol (allyl carbonate) by preparing a monolithic, partially cured, first polymerizate of polyol (allyl carbonate), forming a pool of polyol (allyl carbonate) monomer in contact with the monolithic, partially cured, first polymerizate, and thereafter forming a thick, single phase polyol (allyl carbonate) polymer. Also disclosed is the polymer prepared therefrom.

## Claims

### Claim 1

A method of forming a thick casting of polyol (allyl carbonate) comprising:
(a) forming a monolithic rigid sheet comprising partially cured polymeric polyol (allyl carbonate);
(b) forming a pool of polyol (allyl carbonate) monomer in contact with the monolithic rigid sheet of partially cured polymer; and
(c) thereafter curing the monolithic rigid sheet of partially cured (monolithic polymerizate) polymer and the monomer in contact therewith whereby to form a single phase (second polymerizate) casting thicker than the monolithic rigid sheet.

### Claim 2 (depends on 1)

The method of claim 1 comprising first curing said monomer to form the monolithic rigid sheet of partially cured polymer having a fifteen second Barcol hardness of less than 20, and thereafter curing the partially cured monolithic rigid sheet of partially cured polymer and the monomer in contact therewith whereby to form a single phase casting having a fifteen second Barcol hardness greater than 28.

### Claim 3 (depends on 1)

The method of claim 1 wherein the single phase second casting has a substantially uniform index of refraction.

### Claim 4 (depends on 1)

The method of claim 1 wherein the polyol (allyl carbonate) is a diol bis(allyl carbonate) having the formula ##STR18## where R.sub.1 and R.sub.3 are chosen from the group consisting of allyl groups independently represented by the formula ##STR19## where R.sup.1 is chosen from the group consisting of hydrogen, halogen and C.sub.1 to C.sub.4 alkyls, and R.sub.3 is chosen from the group consisting of alkylene groups, alkylene ether groups, alkylene polyether groups, alkylene carbonate groups, and alkylene polyether groups.

### Claim 5 (depends on 4)

The method of claim 4 wherein the diol bis(allyl carbonate) is diethylene glycol bis(allyl carbonate).

### Claim 6

A method of forming a thick casting of polyol bis(allyl carbonate) comprising:
(a) forming a monolithic rigid sheet having a fifteen second Barcol hardness of less than 20 and comprising partially cured polymeric polyol bis(allyl carbonate);
(b) forming a pool of polyol (allyl carbonate) monomer in contact with the monolithic rigid sheet of partially cured polymer; and
(c) thereafter curing the monolithic rigid sheet of partially cured polyol(allyl carbonate) and the polyol(allyl carbonate) monomer in contact therewith whereby to form a single phase casting having a fifteen second Barcol hardness greater than 28.

### Claim 7 (depends on 6)

The method of claim 6 wherein the polyol (allyl carbonate) is diethylene glycol bis(allyl carbonate).