Arclin, a Canadian maker of resins and other construction-related materials, has filed for bankruptcy protection in both Canada and the United States. It also has reached an agreement to restructure its debt. Teachers’ Private Capital bought a majority stake in Arclin two years ago.

Kellwood Co., an apparel maker bought last year by Sun Capital Partners, failed to re-negotiate and extend a $140 million bond issue before it matured.

The Lang Companies, a Delafield, Wis.-based maker of stationary and related products, has filed for Chapter 11 bankruptcy protection. Catterton Partners acquired Lang in 2003, and holds more than a 90 percent equity position.

TowerBrook Capital Partners has filed an involuntary bankruptcy petition against Wilton Holdings Inc., a GTCR-owned maker of food decoration equipment. Towerbrook, via an affiliate, is one of Wilton’s creditors.