(a) Where a collective bargaining agreement between an employer and a labor organization contains a successor clause, such clause shall be binding upon and enforceable against any successor employer who succeeds to the contracting employer's business, until the expiration date of the agreement therein stated. No such successor clause shall be binding upon or enforceable against any successor employer for more than 3 years from the effective date of the collective bargaining agreement between the contracting employer and the labor organization.(b) As used in this Section, "successor employer" means any purchaser, assignee, or transferee of a business the employees of which are subject to a collective bargaining agreement, if such purchaser, assignee, or transferee conducts or will conduct substantially the same business operation, or offer the same service, and use the same physical facilities, as the contracting employer.(c) This Section shall not apply to a receiver or trustee in bankruptcy of any contracting employer who has gone into receivership or bankruptcy, or to any employer who acquires a business from a receiver or trustee in bankruptcy.(d) An employer who is a party to a collective bargaining agreement containing a successor clause has the affirmative duty to disclose the existence of such agreement and such clause to any successor employer. Such disclosure requirement shall be satisfied by including in any contract of sale, agreement to purchase, or any similar instrument of conveyance, a statement that the successor employer is bound by such successor clause as provided for in the collective bargaining agreement. Failure of an employer to disclose the existence of a collective bargaining agreement containing a successor clause as required by this subsection (d) shall not affect the enforceability of such collective bargaining agreement against a successor employer.