
<PAGE>
 
                                                                Exhibit 3.15(ii)

                           ARTICLES OF AMENDMENT TO
                           ------------------------

                           ARTICLES OF INCORPORATION
                           -------------------------

                                      OF
                                      --

                         PETROPAR NORTH AMERICA CORP.
                         ----------------------------

     Petropar North America Corp., a corporation organized and existing under
and by virtue of the Business Corporation Act of the State of North Carolina
(the "Corporation"),

          DOES HEREBY CERTIFY:

     FIRST:  That the Board of Directors of the Corporation adopted a resolution
amending Article One of the Articles of Incorporation of the Corporation to read
in its entirety as follows:

                                  ARTICLE ONE
                                  -----------

     The name of the corporation is PNA Corp.

     SECOND:  That thereafter, pursuant to said resolution, the amendment was
submitted for approval to the holders of the outstanding shares of the
Corporation entitled to vote thereon, which approval was given by written
consent pursuant to Section 55-7-04 of the North Carolina Business Corporation
Act.

     THIRD:  That said amendment was duly adopted in accordance with the
provisions of Section 55-10-06 of the North Carolina Business Corporation Act.

     IN WITNESS WHEREOF, Petropar North America Corp. has caused this
certificate to be signed this 15th day of August, 1996.

                                       PETROPAR NORTH AMERICA CORP.

                                       /s/ Jerry Zucker
                                       --------------------------------------
                                       By:  Jerry Zucker
                                       Its: President
