Claims
- 1. A solid polymer having a heterogeneous morphology, comprising(a) a solid polymer, and (b) a modified portion of said polymer, the modified portion being in a surface layer of the polymer, wherein a portion of the surface layer of the polymer is foamed to a certain degree, and the rest of the surface layer of the polymer is foamed to a different degree.
- 2. A polymer according to claim 1, wherein the polymer is selected from the group consisting of thermoplastic amorphous polymers and thermoplastic semi-crystalline polymers.
- 3. A polymer according to claim 1, wherein the polymer is selected from the group consisting of PMMA, PETG and polycarbonate.
Parent Case Info
At the top of page one, after the title, please enter the heading “Cross-reference to Related Application”, followed by a new paragraph “This application is a Divisional of U.S. application Ser. No. 09/161,448, filed Sep. 28, 1998, now U.S. Pat. No. 6,080,798.”
US Referenced Citations (3)
Number |
Name |
Date |
Kind |
3293094 |
Narin et al. |
Dec 1966 |
A |
3293108 |
Narin et al. |
Dec 1966 |
A |
6140379 |
Yang |
Oct 2000 |
A |