Nov 21, 2011. /Lesprom Network/. International Paper (IP) made a $300 million voluntary contribution to its U.S. pension fund. The last voluntary pension contribution the company made was in September of 2010, adding $650 million to the fund. Within the last 17 months, IP has now added $1.45 billion in voluntary contributions to its U.S. pension fund. "These contributions help fulfill our long-term funding requirements and reinforce IP's commitment to maintaining a sound retirement program for its employees and pension beneficiaries," said Robert Hunkeler , International Paper's vice president of investments. International Paper is a global paper and packaging company with manufacturing operations in North America , Europe , Latin America , Russia , Asia and North Africa . Its businesses include uncoated papers and industrial and consumer packaging, complemented by xpedx, the Company's North American distribution company.